Note 16 - Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 16 - Employee Benefit Plans (Details) [Line Items]
Number of Employee Work Hours	1000 hours
Defined Benefit Plan Employer Additional Contribution of Stock Percent	2.00%
Defined Contribution Plan, Cost Recognized	$ 1,800,000	$ 1,700,000	$ 1,700,000
Defined Contribution Plan Shares Held in Employee Stock Ownership and Profit Sharing Plan (in Shares)	433,400	489,005
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 171,000	$ 228,000	$ 205,000
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 4,900,000	4,700,000
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	$ 2,100,000	$ 2,200,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.28%	3.85%
Post-Retirement and Post-Employment Benefits Liability, Other	$ 0
Maximum [Member]
Note 16 - Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%