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Income Taxes - Tax Effects of Temporary Differences and Carry-Forwards (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
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