Note 1 - Summary of Significant Interim Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months				Nine Months
	Ended September 30,				Ended September 30,
	2016		2015		2016		2015
Net earnings used in the computation of basic and diluted earnings per share	$	4,386,000	$	4,031,000	$	9,721,000	$	9,698,000
Weighted average shares outstanding - basic		14,118,354		13,833,561		14,055,345		13,716,376
Common stock equivalents		865,730		752,127		814,726		853,995
Weighted average shares outstanding - diluted		14,984,084		14,585,688		14,870,071		14,570,371
Per Share Data:
Basic
Net earnings	$	0.31	$	0.29	$	0.69	$	0.71
Diluted
Net earnings	$	0.29	$	0.28	$	0.65	$	0.67

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Stock options and SARS	$	237,000	$	251,000	$	1,070,000	$	1,079,000
Restricted stock		78,000		69,000		229,000		206,000
Performance shares		68,000		-		182,000		-
Total share-based compensation expense	$	383,000	$	320,000	$	1,481,000	$	1,285,000
Related income tax benefit	$	55,000	$	25,000	$	267,000	$	195,000

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

	No. of			Weighted Average
	Shares			Exercise Price
Outstanding December 31, 2015		946,546		$	8.39
Granted		172,862			16.53
Exercised		(178,179	)		7.55
Lapsed		(11,131	)		5.92
Cancelled		(3,260	)		17.53
Outstanding September 30, 2016		926,838		$	10.06

Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]

	No. of			Weighted Average
	Shares			Exercise Price
Outstanding December 31, 2015		381,566		$	8.14
Granted		58,108			16.35
Exercised		(75,792	)		6.12
Lapsed		-			-
Cancelled		-			-
Outstanding September 30, 2016		363,882		$	9.87

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

Three months ended
September 30,	SARS		Options
Exercise price
2016		N/A		$16.47
2015		N/A		$17.40
Market price
2016		N/A		$16.47
2015		N/A		$17.40
Risk free interest rate 1
2016		N/A		1.1%
2015		N/A		1.6%
Expected award life (years) 2		N/A		5
Expected volatility 3
2016		N/A		37.1%
2015		N/A		36.8%
Expected dividend yield 4
2016		N/A		2.1%
2015		N/A		1.9%

Nine months ended
September 30,	SARS		Options
Exercise price
2016		$16.35	$16.35	-	$18.55
2015		$18.66	$16.78	-	$18.66
Market price
2016		$16.35	$16.35	-	$18.55
2015		$18.66	$16.78	-	$18.66
Risk free interest rate 1
2016		1.3%	1.1%	-	1.8%
2015		1.5%	1.5%	-	2.1%
Expected award life (years) 2		5	5	-	10
Expected volatility 3
2016		36.5%	36.5%	-	40.3%
2015		34.9%	34.9%	-	39.0%
Expected dividend yield 4
2016		2.0%	1.8%	-	2.1%
2015		1.6%	1.6%	-	1.9%

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

	No. of		Weighted Average
	Shares		Grant Date Fair Value
Outstanding December 31, 2015		114,342	$	8.39
Granted		-		-
Vested		-		-
Forfeited		(1,050)		21.92
Outstanding September 30, 2016		113,292	$	8.26

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

	No. of		Weighted Average
	Shares		Grant Date Fair Value
Outstanding December 31, 2015		-	$	-
Granted		101,000		16.36
Vested		-		-
Forfeited		-		-
Outstanding September 30, 2016		101,000	$	16.36