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Note 7 - Indebtedness - Interest Expense on the Notes (Details) - The Notes [Member] - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Coupon interest expense at 1.375% | $ 593 | $ 593
Amortization of debt discounts and issuance costs | 230 | 225
Total interest and amortization of debt issuance costs | $ 823 | $ 818

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