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Note 3 - Fair Value Measurements - Fair Value and Carrying Value of the Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Reported Value Measurement [Member] |  |
Notes | $ 144,302 | $ 140,278
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes | $ 206,569 | $ 173,363

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- 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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