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Note 9 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2016

Notes Tables

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

		Year E nded March 31,
		2016				201 5				201 4
Total cost of stock based compensation charged against income before income tax		$	1,327			$	993			$	840
Amount of income tax benefit recognized in earnings			374				373				263
Amount charged against net income		$	953			$	620			$	577
Impact on net income per common share:
Basic		$	0.26			$	0.18			$	0.17
Diluted			0.25				0.17				0.16

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

		Year E nded March 31,
		2016					201 5					201 4
Volatility		27.1%	-	30.2%			24.4%	-	27.1%			26%	-	28.7%
Risk-free interest rate			1.09%				1.9%	-	2.3%			.8%	-	2.1%
Expected option life (years)			8				6	-	8			5	-	10
Dividend yield			.7%					.9%					1.1%

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, 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
Granted			184,030				72.89				6.7				--
Forfeited			(16,334	)			75.16				6.5				--
Expired			--				--				--				--
Exercised			(89,224	)			38.28				--				--
Outstanding at March 31, 2016			515,720				64.32				5.2				16,561
Exercisable at March 31,
2016			157,457				42.49				3.6				8,481
2015			163,210				33.35				3.6				6,341
2014			140,825				26.70				3.5				8,949

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

		Unvested Shares				Weighted- a verage Grant-date Fair Value
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
Options granted			184,030				18.78
Options forfeited			(16,334	)			19.07
Options vested			(83,471	)			14.65
Unvested at March 31, 2016			358,263				19.46

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- Definition

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.

+ References

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