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Note 10 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2017

Notes Tables

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

		Year Ended March 31,
		2017				2016				2015
Total cost of stock based compensation
charged against income before income tax		$	1,411			$	1,327			$	993
Amount of income tax benefit recognized in earnings			307				374				373
Amount charged against net income		$	1,104			$	953			$	620
Impact on net income per common share:
Basic		$	0.30			$	0.26			$	0.18
Diluted			0.29				0.25				0.17

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

		Year E nded March 31,
		2017					201 6					201 5
Volatility		32.05%	-	33.76%			27.1%	-	30.2%			24.4%	-	27.1%
Risk-free interest rate			1.22%					1.09%				1.9%	-	2.3%
Expected option life (years)			5					8				6	-	8
Dividend yield			.55%					.7%					.9%

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

		Number of Shares				Weighted- A verage Exercise Price				Weighted- A verage Remaining Contractual Term				Aggregate Intrinsic Value (000s)
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
Granted			134,955				102.52				5.5				--
Forfeited			(35,015	)			87.5				4.5				--
Expired			(904	)			41.51				--				--
Exercised			(104,395	)			50.12				--				--
Outstanding at March 31, 2017			510,361				75.78				5.0				23,956
Exercisable at March 31,
2017			136,595				50.61				3.9				9,847
2016			157,457				42.49				3.6				8,481
2015			163,210				33.35				3.6				6,341

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

		Unvested Shares				Weighted- average Grant-D ate Fair Value
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
Options granted			134,955				31.27
Options forfeited			(35,015	)			22.64
Options vested			(84,437	)			16.96
Unvested at March 31, 2017			373,766				22.49

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