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Note 10 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2018

Notes Tables

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

		Year E nded March 31,
		201 8				2017				2016
Total cost of stock-based compensation charged against earnings before income taxes		$	1,672			$	1,411			$	1,327
Amount of income tax benefit recognized in earnings			1,194				1,737				794
Amount charged (added) against (to) net (loss) income		$	478			$	(326	)		$	533
Impact on net (loss) income per common share:
Basic		$	0.13			$	(0.09	)		$	0.15
Diluted			0.13				(0.08	)			0.14

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

		Year E nded March 31,
		2018					2017					201 6
Volatility		32.85%	-	35.44%			32.05%	-	33.76%			27.1%	-	30.2%
Risk-free interest rate			1.77%					1.22%					1.09%
Expected option life (years)			6					5					8
Dividend yield			. 57%					.55%					.70%

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, 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
Granted			96,330				123.13				5.0				--
Forfeited			(72,166	)			90.07				4.2				--
Expired			(1,024	)			82.24				--				--
Exercised			(75,143	)			57.99				--				--
Outstanding at March 31, 2018			458,358				86.38				4.5				28,445
Exercisable at March 31,
2018			143,836			$	62.96				4.0			$	12,295
2017			136,595				50.61				3.9				9,847
2016			157,457				42.49				3.6				8,481

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

		Unvested Shares				Weighted- a verage Grant-D ate Fair Value
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
Options granted			96,330				39.06
Options forfeited			(72,166	)			28.43
Options vested			(83,408	)			21.84
Unvested at March 31, 2018			314,522				29.01

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