Note 16 - Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

	2015			2014			2013
Expected volatility	41.84%	-	58.25%	35.14%	-	46.32%	44.17%	-	71.58%
Expected term (years)	1.25	-	6.83	1.75	-	4.75	1.25	-	4.75
Risk-free interest rate	0.24%	-	1.93%	0.43%	-	1.50%	0.12%	-	1.37%

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

				Weighted Average
	Number of Shares			Exercise Price		Options Exercisable
Outstanding at December 31, 2014		2,070,672		$	12.08		971,797
Granted		333,601			39.76
Exercised		(691,985	)		8.40
Forfeited or expired		(80,375	)		14.48
Outstanding at December 31, 2015		1,631,913			19.17
Exercisable at December 31, 2015		709,255		$	12.30

Schedule of Nonvested Share Activity [Table Text Block]

	Nonvested Stock Options					Nonvested Restricted Stock
	Number of Shares			Weighted- Average Grant- Date Fair Value		Number of Shares			Weighted- Average Grant- Date Fair Value
Nonvested at December 31, 2014		1,098,875		$	7.14		-		$	-
Granted		333,601			15.29		9,075			39.48
Vested during period		(429,443	)		6.62		(8,897	)		39.34
Forfeited		(80,375	)		6.90		-			-
Nonvested at December 31, 2015		922,658		$	10.35		178		$	46.91