Note 17 - 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]

	2016				2015				2014
Expected volatility		42.09%	-	46.49%		41.84%	-	58.25%		35.14%	-	46.32%
Expected term (in years)		0.99	-	6.80		1.25	-	6.83		1.75	-	4.75
Risk-free interest rate		0.54%	-	1.63%		0.24%	-	1.93%		0.43%	-	1.50%

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

				Weighted Average
	Number of Shares			Exercise Price		Options Exercisable
Outstanding at December 31, 2015		1,631,913		$	19.17		709,255
Granted		299,230			40.95
Exercised		(398,680	)		12.39
Forfeited or expired		(13,125	)		21.85
Outstanding at December 31, 2016		1,519,338			25.22
Exercisable at December 31, 2016		701,797		$	17.72

Schedule of Nonvested Share Activity [Table Text Block]

	Nonvested Stock Options					Nonvested Restricted Stock					Nonvested Performance Shares
	Number of Shares			Weighted- Average Grant- Date Fair Value		Number of Shares			Weighted- Average Grant- Date Fair Value		Number of Shares			Weighted- Average Grant- Date Fair Value
Nonvested at December 31, 2015		922,658		$	10.35		178		$	46.91		350,000		$	21.29
Granted		299,230			15.17		10,900			45.02		116,750			39.50
Vested during period		(391,223	)		9.57		(10,818	)		45.15		(150,000	)		16.91
Forfeited		(13,125	)		9.32		-			-		-			-
Nonvested at December 31, 2016		817,540		$	12.50		260		$	41.05		316,750		$	30.08