Note 14 - Employee Benefit Plans (Details) - Deferred Compensation Agreements - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Agreements [Abstract]
Balance, beginning	$ 7,503,692	$ 6,224,368	$ 5,151,630
Balance, ending	8,875,025	7,503,692	6,224,368
Company expense	726,001	661,611	557,663
Employee deferrals	693,656	628,589	525,469
Cash payments made	$ (48,324)	$ (10,876)	$ (10,394)