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Note 16 - Income Taxes - Reconciliation Between U.S. Federal Statutory Rate and Effective Rate (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statutory federal income tax rate	35.00%	35.00%	35.00%
State tax expense, net of federal benefit	4.50%	4.80%	4.90%
Permanent items, including nondeductible expenses	0.50%	(0.30%)	0.10%
State investment tax credit	(0.10%)	0.00%	(0.10%)
Federal, state and foreign research and development credits	(0.90%)	(0.40%)	(0.70%)
Foreign rate differential	(0.10%)	0.10%	0.20%
Domestic production deduction	(2.90%)	(2.90%)	(1.70%)
Effective income tax rate	36.00%	36.30%	37.70%

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to permanent items including nondeductible expenses.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit.

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