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Note 12 - Income Taxes - Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. federal statutory rate in effect	35.00%	35.00%	35.00%
State and local taxes, net of federal benefit	3.60%	11.80%	1.40%
Sec. 199 manufacturing deduction	(3.80%)	(33.60%)	0.00%
Meals and entertainment	1.80%	64.30%	(0.60%)
Tax credits	(1.30%)	(48.70%)	0.40%
Change in valuation allowance	0.60%	205.40%	0.00%
Change in U.S. federal statutory rate	(37.70%)	0.00%	0.00%
Change in tax affect of SERP	(11.40%)	0.00%	0.00%
Goodwill impairment	0.00%	0.00%	(17.10%)
All other, net	(2.80%)	122.40%	1.20%
Effective income tax rate	(16.00%)	356.60%	20.30%

X

- Definition

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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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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 goodwill impairment.

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