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Note 6 - Indebtedness - Interest Expense on the Notes (Details) - The Notes [Member] - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Coupon interest expense at 1.375% | $ 593 | $ 593
Amortization of debt discounts and issuance costs | 221 | 1,326
Total | $ 814 | $ 1,919

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