Note 14 - Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]

	2016		2015		2014
Matching contribution	$	1,365,111	$	1,314,276	$	1,179,979
Discretionary contribution		-		-		198,800
	$	1,365,111	$	1,314,276	$	1,378,779

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

	2016			2015			2014
Balance, beginning	$	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, ending	$	10,389,326		$	8,875,025		$	7,503,692