Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent	38.80%	37.00%	39.20%
Deferred Tax Assets, Net of Valuation Allowance	$ 34,700
Deferred Tax Liabilities, Gross	16,777	$ 17,962
Income Tax Examination, Penalties and Interest Expense	0	0	$ 0
Deferred Tax Assets, Valuation Allowance	0	0
Deferred Tax Assets, Valuation Allowance	$ 0	$ 0