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Note 5 - Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 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]

		Three Months Ended June 30,
		2015				2014
Total cost of stock-based compensation charged against income before income taxes		$	327			$	279
Amount of income tax benefit recognized in earnings			113				98
Amount charged against net income		$	214			$	181
Impact on net income per common share:
Basic		$	0.06			$	0.05
Diluted			0.06				0.05

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

		Number of Shares				Weighted- Average Exercise Price per Share				Weighted- Average Remaining Contractual Term				Aggregate Intrinsic Value (000s)
Outstanding at March 31, 2015			437,248			$	55.81				4.9			$	9,445
Stock options granted			167,270				70.78				7.6
Stock options forfeited			(4,691	)			71.71				6.8
Stock options expired			--				--
Stock options exercised			(35,034	)			35.21
Outstanding at June 30, 2015			564,793				61.39				5.7				15,639
Exercisable at June 30, 2015			204,379				41.32				3.9				9,740

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

		Number of Shares				Weighted-Average Grant-Date Fair Value
Unvested at March 31, 2015			274,038			$	18.42
Stock options granted			167,270				18.40
Stock options forfeited			(4,691	)			19.15
Stock options vested			(76,203	)			14.55
Unvested at June 30, 2015			360,414				19.22

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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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