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Note 7 - Changes in Shareholders' Equity and Comprehensive Income: (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock Repurchased and Retired During Period, Shares	613,000	0
Stock Repurchased and Retired During Period, Value	$ 11.5
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 28.7

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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-Topic 210
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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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