Note 16 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Employer Additional Contribution of Stock, Percent	6.00%	2.00%
Defined Contribution Plan, Cost Recognized	$ 1,900	$ 1,800	$ 1,700
Defined Contribution Plan, Shares, Held in Employee Stock Ownership and Profit Sharing Plan	567,000	433,400
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 293	$ 171	$ 228
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 5,600	$ 4,900
Defined Benefit Plan, Number of Employees Covered	3
Defined Benefit Plan, Number of Present Employees Covered	2
Defined Benefit Plan, Number of Retired Employees Covered	1
Deferred Compensation Arrangement with Individual, Requisite Service Period	25 years
Defined Benefit Plan, Number of Current Officers Fully Vested	1
Defined Benefit Plan, Number of Current Officers That Will Be Fully Vested in Year 2017	1
Defined Benefit Plan, Accumulated Benefit Obligation	$ 2,100
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.10%	4.28%