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Note 9 - Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Computed “expected” tax rate 34.00% 34.00% 34.00%
Increase (decrease) in income taxes resulting from:      
State taxes, net of federal tax benefit 3.50% 3.70% 2.30%
Meals and entertainment 0.30% 0.20% 0.30%
R&D credits (0.60%) (0.60%) (0.80%)
Domestic production deduction (2.60%) (2.50%) (2.50%)
Non-deductible ISO stock option expense 0.10% 0.30% 0.40%
Unrecognized tax benefits (0.10%)
Excess tax benefits on equity awards (1.40%)
Impact on deferred taxes of new legislation (11.10%)
Other 0.10% 0.30% 1.60%
Effective tax rate 22.30% 35.30% 35.30%