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Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
Principal | $ 513,051 | $ 513,605
Unamortized discount/premium and issuance costs | (4,956) | (4,753)
Long-term debt balance | 508,095 | 508,852
The 2028 Senior Notes [Member] |  |
Principal | 475,000 | 475,000
Unamortized discount/premium and issuance costs | (5,552) | (5,324)
Long-term debt balance | 469,448 | 469,676
IQ Notes [Member] |  |
Principal | 38,051 | 38,605
Unamortized discount/premium and issuance costs | 596 | 571
Long-term debt balance | $ 38,647 | $ 39,176

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