Note 16 - Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	201 7			201 6			201 5
Dividend yield (1)	0.0%			0.0%			0.0%
Expected volatility (2)	44.00%	to	50.09%	46.38%	to	52.54%	53.78%	to	56.00%
Risk-free interest rate (3)	1.89%	to	2.30	1.23%	to	1.82%	1.49%	to	2.00%
Expected life (in years) (4)	5.5	to	7.0	5.5	to	7.0	5.5	to	7.0
Assumed forfeiture rate (5)	6.0%			10.0%			19.0%

Share-based Compensation, Activity [Table Text Block]

	201 7		201 6		201 5
Stock based compensation expense recognized	$	1,842,000	$	759,000	$	600,000
Number of unvested stock options		1,659,102		1,283,226		1,173,276
Fair value of unvested stock options	$	4,587,565	$	2,184,773	$	1,906,691
Amount remaining to be recognized as expense	$	2,508,314	$	1,104,424	$	873,714

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

	For the Years Ended December 31,
	201 7					201 6					201 5
	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of year		2,332,900		$	3.70		1,947,725		$	3.56		1,495,899		$	3.59
Granted		916,000			8.03		661,750			4.06		505,200			3.55
Exercised		(197,975	)		3.26		(226,275	)		3.21		(21,500	)		3.01
Forfeited		(45,100	)		7.95		(50,300	)		5.21		(31,874	)		5.13
Outstanding, end of year		3,005,825		$	4.98		2,332,900		$	3.70		1,947,725		$	3.56
Options exercisable at year-end		1,346,723		$	3.55		1,049,674		$	3.70		772,949		$	4.18
Weighted average fair value of options granted during the year				$	3.75				$	1.80				$	1.89

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

	For the Years Ended December 31,
	201 7		201 6		201 5
Number of options exercised		197,975		226,275		21,500
Cash received	$	646,263	$	726,157	$	64,624
Intrinsic value	$	991,957	$	739,699	$	26,532
Tax benefit	$	81,589	$	-	$	-

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- Average Exercise Price
$1.55	to	$3.53		559,075		4.5	$	2.53		546,075	$	2.50
$3. 55	to	$3.95		757,150		6.5		3.62		404,112		3.64
$3.9 9	to	$7.85		761,600		6.9		4.43		376,536		4.73
$ 8.00	to	$9.50		928,000		9.0		8.03		20,000		8.00
				3,005,825			$	4.98		1,346,723	$	3.55

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Share s			Weighted- Average Grant Date Fair Value
Nonvested, beginning of year		1,283,226		$	1.70
Granted		916,000			3.75
Vested		(529,624	)		1.76
Forfeited		(10,500	)		2.51
Nonvested, end of year		1,659,102		$	2.77