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Note 9 - Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2015

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

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

		Year Ended March 31,
		2015				2014				2013
Total cost of stock based compensation charged against income before income tax		$	993			$	840			$	1,112
Amount of income tax benefit recognized in earnings			373				263				388
Amount charged against net income		$	620			$	577			$	724
Impact on net income per common share:
Basic		$	0.18			$	0.17			$	0.22
Diluted			0.17				0.16				0.20

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

	Year Ended March 31,
	2015			2014			2013
Volatility	24.4%	-	27.1%	26%	-	28.7%	27.5	-	31.1%
Risk-free interest rate	1.9%	-	2.3%	0.8%	-	2.1%	0.6	-	1.0%
Expected option life (years)	6	-	8	5	-	10	5	-	10
Dividend yield		0.9%			1.1%			1.4%

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

		Number of Shares				Weighted- average Exercise Price				Weighted- average Remaining Contractual Term				Aggregate Intrinsic Value (000s)
Outstanding at March 31, 2012			433,785			$	22.77				3.9			$	11,516
Granted			116,080				49.97				5.9				--
Forfeited			(40,375	)			32.87				--				--
Expired			(40	)			18.98				--				--
Exercised			(93,325	)			20.56				--				--
Outstanding at March 31, 2013			416,125				29.87				3.7				9,529
Granted			128,124				55.33				6.4				--
Forfeited			(27,782	)			52.50				--				--
Expired			(410	)			52.50				--				--
Exercised			(117,885	)			22.17				--				--
Outstanding at March 31, 2014			398,172				38.75				4.4				20,505
Granted			147,720				88.62				7.0				--
Forfeited			(26,466	)			64.62				--				--
Expired			--				--				--				--
Exercised			(82,178	)			28.87				--				--
Outstanding at March 31, 2015			437,248				55.81				4.9				9,445
Exercisable at March 31,
2015			163,210				33.35				3.6				6,341
2014			140,825				26.70				3.5				8,949
2013			158,320				21.00				3.0				5,031

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

		Unvested Shares				Weighted-average Grant-date Fair Value
Unvested at March 31, 2012			284,875			$	7.28
Options granted			116,065				12.43
Options forfeited			(38,720	)			8.86
Options vested			(104,415	)			6.69
Unvested at March 31, 2013			257,805				9.55
Options granted			128,124				15.90
Options forfeited			(27,782	)			14.75
Options vested			(100,800	)			8.53
Unvested at March 31, 2014			257,347				11.86
Options granted			147,720				24.49
Options forfeited			(26,466	)			17.29
Options vested			(104,563	)			10.36
Unvested at March 31, 2015			274,038				18.42

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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