Note 16 - Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	201 6				201 5				201 4
Dividend yield (1)			0.0	%			0.0	%			0.0	%
Expected volatility (2)	46.38%	to	52.54	%	53.78%	to	56.00	%	55.79%	to	57.99	%
Risk-free interest rate (3)	1.23%	to	1.82	%	1.49%	to	2.00	%	1.51%	to	2.26	%
Expected life (4) (years)	5.5	to	7.0		5.5	to	7.0		5.5	to	7.0
Assumed forfeiture rate (5)			10.0	%			19.0	%			23.0	%

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

	201 6		201 5		201 4
Stock based compensation expense recognized	$	759,000	$	600,000	$	420,000
Number of unvested stock options		1,283,226		1,173,276		1,039,638
Fair value of unvested stock options	$	2,184,773	$	1,906,691	$	1,548,840
Amount remaining to be recognized as expense	$	1,104,424	$	873,714	$	702,220

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

	For the Years Ended December 31,
	2016					2015					2014
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of year		1,946,225		$	3.56		1,494,399		$	3.59		1,215,530		$	3.66
Granted		661,750			4.06		505,200			3.55		360,900			3.69
Exercised		(226,275	)		3.21		(21,500	)		3.01		(500	)		1.95
Forfeited		(50,300	)		5.21		(31,874	)		5.13		(81,531	)		5.15
Outstanding, end of year		2,331,400		$	3.70		1,946,225		$	3.56		1,494,399		$	3.59
Options exercisable at year-end		1,048,174		$	3.70		772,949		$	4.18		454,761		$	5.06
Weighted average fair value of options granted during the year				$	1.80				$	1.89				$	2.07

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

	For the Years Ended December 31,
	2016		201 5		2014
Number of options exercised		226,275		21,500		500
Cash received	$	726,157	$	64,624	$	975
Intrinsic value	$	739,699	$	26,532	$	1,010
Tax benefit	$	-	$	-	$	-

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Options Outstanding									Options Exercisable
Range of Exercise Prices			Number Outstanding		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Shares		Weighted- A verage Exercise Price
$1.55	to	$2.95		538,675		5.7	$	2.36		361,837	$	2.20
$3.14	to	$3.68		897,275		7.3		3.55		428,137		3.51
$3.95	to	$8.00		886,100		7.3		4.58		248,850		5.89
$11.77	to	$12.13		9,350		-		11.77		9,350		11.77
				2,331,400			$	3.70		1,048,174	$	3.70

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Share s			Weighted- Average Grant Date Fair Value
Nonvested, beginning of year		1,173,276		$	1.63
Granted		661,750			1.80
Vested		(517,550	)		1.53
Forfeited		(34,250	)		2.01
Nonvested, end of year		1,283,226		$	1.70