Note 14 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 3,643,000	$ 4,830,000	$ 12,587,000	$ 13,619,000
Effective Income Tax Rate Reconciliation, Percent	34.60%	35.00%		35.80%
Excess Tax Benefits from Share-based Compensation	$ 0		$ 300,000
Decrease in Effective Income Tax Rate due to Excess Tax Benefits from Share-based Compensation	0.00%		0.90%
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		$ 0		$ 400,000
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0		$ 0