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Note 7 - Changes in Shareholders' Equity (Details Textual) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Stock Repurchased and Retired During Period, Shares (in shares)	0	0
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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	na
Period Type:	duration