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Income Taxes - Tax Effects of Temporary Differences and Carry-Forwards (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Assets [Abstract] |  |
Inventory reserve | $ 286,000 | $ 239,000
Other reserves and accruals | 311,000 | 358,000
Stock-based compensation | 8,000 | 6,000
Tax credit carryforwards | 1,717,000 | 1,724,000
Federal tax loss carryforwards | 892,000 | 1,169,000
State tax loss carryforwards | 252,000 | 250,000
Foreign tax loss carryforwards | 35,000 | 67,000
Total deferred income taxes | 3,501,000 | 3,813,000
Valuation allowance | (379,000) | (388,000)
Total deferred income tax liabilities | 70,000 | 118,000
Net deferred tax assets | 3,052,000 | 3,307,000
Deferred Tax Liabilities [Abstract] |  |
Fixed assets | 58,000 | 100,000
Other | 12,000 | 18,000
Total deferred income tax liabilities | $ 70,000 | $ 118,000

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