Note 14 - Employee Benefit Plans - Deferred Compensation Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance	$ 8,875,025	$ 7,503,692	$ 6,224,368
Company expense	832,974	726,001	661,611
Employee deferrals	744,168	693,656	628,589
Cash payments made	(62,841)	(48,324)	(10,876)
Balance	$ 10,389,326	$ 8,875,025	$ 7,503,692