Note 6 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Number of			Exercise		Contractual		Value
	Options			Price		Term (yrs.)		(in thousands)
Outstanding at January 1, 2016		231,444		$	15.96
Exercised		(31,008	)		15.17
Forfeited or expired		(3,875	)		15.12
Outstanding at June 30, 2016		196,561		$	16.10		3.00	$	2,470
Exercisable at June 30, 2016		196,161		$	16.08		2.99	$	2,469

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Number of			Grant-Date		Contractual		Value
	RSUs			Fair Value		Term (yrs.)		(in thousands)
Outstanding at January 1, 2016		157,351		$	21.83
Granted		68,010			27.26
Converted		(51,754	)		19.68
Outstanding at June 30, 2016		173,607		$	24.60		1.68	$	4,977
Vested and Convertible at June 30, 2016		-		$	-		-	$	-