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Income Taxes - Tax Effects of Temporary Differences and Carryforwards (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Tax Assets [Abstract] |  |
Inventory reserve | $ 345,000 | $ 286,000
Other reserves and accruals | 262,000 | 338,000
Stock-based compensation | 2,000 | 8,000
Tax credit carryforwards | 318,000 | 1,717,000
Federal tax loss carryforwards |  | 892,000
State tax loss carryforwards | 23,000 | 252,000
Foreign tax loss carryforwards | 34,000 | 35,000
Total deferred income taxes | 984,000 | 3,528,000
Valuation allowance |  | (379,000)
Total deferred income tax liabilities | 1,074,000 | 97,000
Net deferred tax (liabilities) assets | (90,000) |
Net deferred tax (liabilities) assets |  | 3,052,000
Deferred Tax Liabilities [Abstract] |  |
Fixed assets | 44,000 | 58,000
Unrealized gains on marketable securities | 1,024,000 | 27,000
Other | 6,000 | 12,000
Total deferred income tax liabilities | $ 1,074,000 | $ 97,000

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