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Note 3 - Fair Value Measurements - Fair Value and Carrying Value of the Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Reported Value Measurement [Member]
Notes	$ 168,917	$ 145,675
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Notes	$ 211,097	$ 188,780

X

- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Period Type:	instant

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- Details

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- Details

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- Details

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- Details

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