Note 15 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan, Cost Recognized	$ 740,000	$ 750,000	$ 750,000
Self-insured Health Insurance Program, Stop Loss Amount	200,000
Deferred Compensation Liability, Classified, Noncurrent	1,682,000	1,482,000
Defined Benefit Plan, Assets for Plan Benefits	$ 1,800,000	$ 1,700,000