| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash | 13 | 1 | 25 | 12 | 6 | 19 | 0 | 1 | 2 | 3 | 1 | 13 | 1 | 8 |
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| Accounts receivable, net | 25 | 20 | 19 | 20 | 10 | 12 | 14 | 17 | 18 | 15 | 14 | 17 | 19 | 13 |
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| AMP credit receivable | - | - | - | - | - | - | - | - | - | - | - | - | 7 | 3 |
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| Contract assets | - | - | - | - | - | - | - | - | - | 2 | 1 | 2 | 1 | 1 |
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| Inventories | 23 | 22 | 37 | 35 | 24 | 21 | 19 | 23 | 32 | 27 | 33 | 44 | 37 | 40 |
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| Prepaid expenses and other current assets | 4 | 4 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 2 |
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| Total current assets | 75 | 55 | 86 | 78 | 53 | 58 | 35 | 43 | 55 | 51 | 52 | 79 | 70 | 67 |
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| Property and equipment, net | 88 | 80 | 69 | 63 | 52 | 55 | 56 | 49 | 47 | 45 | 44 | 45 | 47 | 46 |
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| Operating lease right-of-use assets | - | - | - | - | - | - | - | - | 16 | 19 | 18 | 16 | 16 | 14 |
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| Intangible assets, net | 9 | 7 | 6 | 5 | 5 | 5 | 16 | 7 | 5 | 4 | 3 | 3 | 2 | 1 |
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| Other assets | 1 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
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| TOTAL ASSETS | 173 | 143 | 164 | 147 | 110 | 118 | 112 | 99 | 123 | 120 | 118 | 145 | 135 | 128 |
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| Line of credit and current maturities of long-term debt | 1 | 0 | 0 | 0 | 3 | - | 0 | - | - | - | 7 | 1 | 6 | 1 |
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| Current portion of finance lease obligations | - | - | - | - | - | - | - | - | 1 | 1 | 2 | 2 | 2 | 2 |
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| Current portion of operating lease obligations | - | - | - | - | - | - | - | - | 1 | 2 | 2 | 2 | 2 | 2 |
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| Accounts payable | 17 | 16 | 28 | 18 | 14 | 16 | 12 | 12 | 22 | 18 | 16 | 26 | 21 | 16 |
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| Accrued liabilities | - | 6 | 8 | 10 | 8 | 8 | 4 | 4 | 5 | 6 | 4 | 4 | 6 | 4 |
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| Customer deposits | - | - | - | - | - | - | - | 24 | 23 | 19 | 12 | 35 | 17 | 18 |
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| Total current liabilities | 48 | 34 | 61 | 52 | 37 | 43 | 41 | 52 | 64 | 48 | 43 | 70 | 54 | 44 |
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| Long-term debt, net of current maturities | 5 | 3 | 3 | 3 | 3 | 3 | 1 | 1 | 1 | 9 | 0 | 7 | 6 | 8 |
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| Long-term portion of lease obligations, finance leases | - | - | - | - | - | - | - | - | 1 | 2 | 2 | 4 | 3 | 4 |
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| Long-term portion of lease obligations, operating leases | - | - | - | - | - | - | - | - | 17 | 20 | 18 | 17 | 16 | 14 |
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| Other | 1 | 2 | 4 | 3 | 3 | 2 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Total long-term liabilities | 7 | 6 | 8 | 7 | 6 | 6 | 5 | 4 | 18 | 31 | 21 | 28 | 26 | 25 |
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| Common stock, $0.001 par value; 45,000,000 shares authorized; 22,593,589 and 21,840,301 shares issued as of December 31, 2024, and December 31, 2023, respectively | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Treasury stock, at cost, 273,937 shares as of December 31, 2024 and December 31, 2023 | - | - | - | - | - | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
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| Additional paid-in capital | 370 | 374 | 376 | 377 | 378 | 379 | 380 | 381 | 383 | 385 | 395 | 397 | 399 | 402 |
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| Accumulated deficit | -252 | -270 | -281 | -287 | -309 | -308 | -312 | -336 | -341 | -342 | -339 | -349 | -341 | -340 |
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| Total stockholders’ equity | 118 | 103 | 95 | 88 | 67 | 69 | 66 | 43 | 41 | 41 | 54 | 46 | 56 | 59 |
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| TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY | 173 | 143 | 164 | 147 | 110 | 118 | 112 | 99 | 123 | 120 | 118 | 145 | 135 | 128 |
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