| May 31, 2012 | May 31, 2013 | May 31, 2014 | May 31, 2015 | May 31, 2016 | May 31, 2017 | May 31, 2018 | May 31, 2019 | May 31, 2020 | May 31, 2021 | May 31, 2022 | May 31, 2023 | May 31, 2024 |
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| Cash and cash equivalents | 2 | 2 | 2 | 6 | 1 | 18 | 17 | 5 | 5 | 5 | 31 | 30 | 49 |
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| Accounts receivable | 3 | 3 | 3 | 1 | 1 | 4 | 3 | 5 | 4 | 5 | 13 | - | 10 |
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| Inventories | 6 | 5 | 6 | 7 | 7 | 7 | 9 | 9 | 8 | 9 | 15 | 24 | 37 |
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| Prepaid expenses and other current assets | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
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| Total current assets | 11 | 11 | 12 | 14 | 9 | 29 | 29 | 20 | 18 | 19 | 60 | 89 | 98 |
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| Property and equipment, net | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 3 |
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| Operating lease right-of-use assets, net | - | - | - | - | - | - | - | - | 2 | 2 | 1 | 6 | 6 |
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| Deferred tax assets, net | - | - | - | - | - | - | - | - | - | - | - | - | 21 |
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| Other non-current assets | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Total assets | 12 | 11 | 12 | 15 | 10 | 31 | 31 | 21 | 21 | 22 | 62 | 98 | 128 |
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| Accounts payable | 2 | 1 | 2 | 1 | 1 | 3 | 2 | 2 | 1 | 3 | 4 | 9 | 5 |
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| Accrued expenses | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 1 | 2 | 4 | 4 | 3 |
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| Operating lease liabilities, short-term | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 0 | 0 |
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| Deferred revenue, short-term | 1 | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Total current liabilities | 5 | 6 | 5 | 7 | 5 | 8 | 11 | 6 | 4 | 9 | 11 | 16 | 11 |
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| Operating lease liabilities, long-term | - | - | - | - | - | - | - | - | 2 | 1 | 0 | 6 | 6 |
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| Deferred revenue, long-term | - | 0 | - | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Other long-term liabilities | - | - | - | - | - | - | - | - | - | - | - | 0 | 0 |
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| Total liabilities | 5 | 6 | 5 | 10 | 11 | 14 | 12 | 6 | 7 | 10 | 11 | 23 | 16 |
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| Preferred stock, $0.01 par value: Authorized: 10,000 shares; Issued and outstanding: none | - | - | - | - | - | - | - | - | - | - | - | - | - |
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| Common stock, $0.01 par value: Authorized: 75,000 shares; Issued and outstanding: 28,995 shares and 28,539 shares at May 31, 2024 and 2023, respectively | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Additional paid-in-capital | - | - | - | - | - | - | - | - | - | - | 118 | - | 131 |
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| Accumulated other comprehensive loss | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | -0 | -0 | -0 | -0 |
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| Accumulated deficit | -45 | -48 | -48 | -54 | -61 | -67 | -66 | -71 | -74 | -76 | -67 | -52 | -19 |
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| Total shareholders' equity | 6 | 5 | 7 | 5 | -1 | 17 | 19 | 15 | 14 | 11 | 51 | 76 | 112 |
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| Total liabilities and shareholders' equity | 12 | 11 | 12 | 15 | 10 | 31 | 31 | 21 | 21 | 22 | 62 | 98 | 128 |
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