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Note 6 - Indebtedness - Interest Expense on the Notes (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
The Notes [Member] |  |
Interest expense (7.2% and 8.4% as of June 30, 2025 and 2024, respectively) | $ 335 | $ 367
Amortization of discount and debt issuance costs | 135 | 145
Total interest and amortization of discount and debt issuance costs | 470 | 512
Term Loan [Member] |  |
Interest expense (7.2% and 8.4% as of June 30, 2025 and 2024, respectively) | 1,292 | 1,439
Amortization of discount and debt issuance costs | 37 | 35
Total interest and amortization of discount and debt issuance costs | $ 1,329 | $ 1,474

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