Note 10 - Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
Total cost of stock-based compensation	$	129,309		$	129,594		$	413,447		$	390,269
Amount of income tax benefit recognized in earnings		(24,311	)		(14,590	)		(67,275	)		(58,393	)
Amount charged against net income	$	104,998		$	115,004		$	346,172		$	331,876

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2013		622,300		$	12.34		3.7	$	2,174,673
Options granted		146,400		$	15.86		6.3
Options cancelled/expired		(16,950	)	$	15.34		--
Options exercised		(67,425	)	$	10.09		--
Outstanding at September 30, 2014		684,325		$	13.24		3.8	$	1,386,223
Exercisable at September 30, 2014		526,600		$	12.61		3.3	$	1,348,418

Schedule of Share-based Compensation Stock Options Unvested Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at December 31, 2013		79,225		$	3.98
Options granted		146,400		$	4.13
Options cancelled		(15,400	)	$	3.98
Options vested		(52,500	)	$	4.39
Unvested at September 30, 2014		157,725		$	3.98