Note 10 - Stock Incentives (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Time-Based Vesting Options Granted and Valuation Assumptions [Table Text Block]

Grant	Number		Exercise		Grant Date		Risk-Free			Estimated			Dividend			Expected
Date	of Shares		Price		Fair Value		Interest Rate			Volatility			Yield			Life (years)
July 2017		76,500	$	12.22	$	2.31		1.94% - 2.08	%		33.7% - 33.9	%		5.12% - 5.15	%		5 yrs to 6 yrs
May 2017		40,000	$	19.945	$	3.40		1.81	%		32	%		5.26	%		5
September 2016		20,000	$	28.48		$4.28 - $4.83		1.21% - 1.50	%		29% - 31	%		4.92	%		5 yrs to 7 yrs
May 2016		40,000	$	31.33	$	7.57		1.74	%		40	%		4.47	%		5
January 2016		5,000	$	27.77	$	6.56		2.00	%		40	%		5.04	%		5

Share-based Compensation Arrangement by Share-based Payment Award, Expenses Related to Options Granted [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(In thousands)				(In thousands)
Time-based vesting options	$	103	$	47	$	298	$	409
Market-based vesting options		(4)		22		67		191
Total compensation expense related to stock options	$	99	$	69	$	365	$	600