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Note 7 - Income Taxes - Income Tax Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expected federal income taxes $ 8,509,000 $ 7,285,000 $ 11,999,000
Foreign tax rate differential 26,000 146,000 (131,000)
State income taxes, net of federal benefit and state tax credits 1,344,000 376,000 608,000
Federal tax credits (419,000) (150,000) (130,000)
Uncertain tax positions 34,000 90,000 151,000
Nondeductible expenses (income) related to recapitalization (24,000) 151,000 504,000
Share based compensation (1,579,000) (3,041,000) (1,564,000)
Compensation limit for covered employees 955,000
Impact of 2017 Tax Act (2,415,000)
Tax depreciation method change (308,000)
Valuation allowance 535,000
Withholding tax on repatriation of foreign earnings 107,000 706,000
GILTI 13,000 40,000
Other 102,000 73,000 122,000
Total $ 8,113,000 $ 4,662,000 $ 11,340,000