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Note 9 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2014

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,
		2014				2013				2012
Total cost of stock based compensation charged against income before income tax		$	840			$	1,112			$	464
Amount of income tax benefit recognized in earnings			263				388				166
Amount charged against net income		$	577			$	724			$	298
Impact on net income per common share:
Basic		$	0.17			$	0.22			$	0.09
Diluted			0.16				0.20				0.09

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

	Year Ended March 31,
	2014	2013	2012
Volatility	26%-28.7%	27.5-31.1%	33.4-33.7%
Risk-free interest rate	.8%-2.1%	0.6-1.0%	0.9-2.2%
Expected option life (years)	5-10	5-10	5-10
Dividend yield	1.1%	1.4%	1.8%

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, 2011			443,642			$	20.10				4.0			$	3,861
Granted			103,780				29.87				5.4				--
Forfeited			(11,940	)			26.06				--				--
Expired			(1,020	)			14.50				--				--
Exercised			(100,677	)			18.00				--				--
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
Exercisable at March 31,
2014			140,825				26.70				3.5				8,949
2013			158,320				21.00				3.0				5,031
2012			148,910				19.28				3.2				4,473

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

		Unvested Shares				Weighted-average Grant-date Fair Value
Unvested at March 31, 2011			291,425			$	6.46
Options granted			103,780				8.33
Options forfeited			(11,395	)			7.31
Options vested			(98,935	)			5.97
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

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Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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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 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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