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Note 13 - Reconciliation of Statutory and Effective Tax Rates (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. stautory rate	35.00%	35.00%	35.00%
State taxes	4.10%	3.10%	3.70%
Valuation allowance	0.60%	0.20%	0.20%
Research and development credits	(2.30%)	(5.00%)	(0.60%)
Other	(0.60%)	(0.90%)	(0.90%)
Effective tax rate	36.80%	32.40%	37.40%

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 attributable to changes in the valuation allowance for deferred tax assets.

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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 research and development expense.

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