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Note 9 - Share-based Payments (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

		Year ended December 31,
		2017				2016				2015
Risk-free interest rate, average			2.21	%			1.52	%			2.00	%
Expected option life, average (in years)			7.9				6.1				6.1
Expected price volatility, average			40.71	%			43.75	%			44.30	%
Expected dividend yield			2.83	%			1.71	%			1.10	%

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

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
As of December 31, 2014			1,040,081			$	5.65				5.60			$	4,286
Granted			56,666				13.03
Reinstated			4,583				4.47
Expired and canceled			(1,000	)			3.42
Forfeited prior to vesting			(15,252	)			7.85
Exercised			(56,143	)			5.51
As of December 31, 2015			1,028,935			$	6.03				4.73			$	7,104
Granted			217,700				11.73
Expired and canceled			(4,186	)			12.03
Forfeited prior to vesting			(17,360	)			10.67
Exercised			(374,857	)			4.46
As of December 31, 2016			850,232			$	8.06				5.78			$	3,001
Granted			105,000				9.90
Expired and canceled			(3,144	)			10.29
Forfeited prior to vesting			(8,996	)			11.01
Exercised			(178,662	)			5.90
As of December 31, 2017			764,430			$	8.78				6.48			$	1,038
Vested and Expected to Vest at December 31, 2015			1,028,935			$	6.03				4.73			$	7,104
Vested at December 31, 2015			820,022			$	5.10				3.74			$	6,419
Vested and Expected to Vest at December 31, 2016			850,232			$	8.06				5.78			$	3,001
Vested at December 31, 2016			552,097			$	6.33				4.09			$	2,843
Vested and Expected to Vest at December 31, 2017			764,430			$	8.78				6.48			$	1,038
Vested at December 31, 2017			529,669			$	7.89				5.50			$	1,033

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

		2017				2016				201 5
Shares purchased under ESPP plans			9,110				9,140				14,982
Plan compensation expense		$	13			$	18			$	31

Class of Treasury Stock [Table Text Block]

$ in thousands except per share price		Total Number of Shares Purchased (a)				Average Price Paid per Share (b)				Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (c)				Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($ thousands) (d)

January 1 to March 31			78,956			$	11.75				78,956			$	9.9
April 1 to June 30			214,866				9.91				214,866				7.7
July 1 to September 30			139,570				7.84				139,570				6.6
October 1 to December 31			118,544				8.18				118,544				5.7
Total			551,936			$	9.28				551,936