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Note 11 - Income Taxes - Deferred Income Tax Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Temporary differences:    
Property and equipment $ (706,000) $ (646,000)
Intangible assets (9,000) (8,000)
Marketable securities
Inventory reserve 24,000 16,000
Accrued expenses and inventory 612,000 443,000
Basis difference in investments 35,000 19,000
Foreign exchange (40,000) (13,000)
AMT/Foreign tax credits 50,000
Other (83,000) (30,000)
State income taxes (44,000) (55,000)
Net deferred income tax liabilities $ (211,000) $ (224,000)