Note 10 - Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

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

Options	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2015		1,631,913		$	19.17
Exercised		(44,279	)		9.47
Forfeited or expired		(5,250	)		16.45
Outstanding at March 31, 2016		1,582,384			19.45
Granted		20,264			45.12
Exercised		(165,210	)		9.30
Outstanding at June 30, 2016		1,437,438			20.98
Exercised		(6,420	)		24.84
Outstanding at September 30, 2016		1,431,018			20.96
Exercisable at September 30, 2016		520,904		$	13.64

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, 2015		922,658		$	10.35		178		$	46.91
Vested during period		(14,875	)		8.11		-			-
Forfeited		(5,250	)		7.76		-			-
Nonvested at March 31, 2016		902,533			10.40		178			46.91
Granted		20,264			13.82		10,640			45.12
Vested during period		(12,683	)		8.49		(178	)		46.91
Nonvested at June 30, 2016		910,114			10.50		10,640			45.12
Nonvested at September 30, 2016		910,114		$	10.50		10,640		$	45.12