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Note 11 - Income Taxes - Deferred Income Tax Assets (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Temporary differences: |  |
Property and equipment | $ (646,000) | $ (448,000)
Intangible assets | (8,000) | (6,000)
Marketable securities |  | 122,000
Inventory reserve | 16,000 | 45,000
Accrued expenses and inventory | 443,000 | 336,000
Basis difference in investments | 19,000 |
Basis difference in investments |  | (80,000)
Foreign exchange | (13,000) | (14,000)
AMT/Foreign tax credits | 50,000 | 25,000
Other | (30,000) | (65,000)
State income taxes | (55,000) | (56,000)
Net deferred income tax liabilities | $ (224,000) | $ (141,000)

X
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax and foreign tax credit carryforwards. + References No definition available. + Details
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