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Note 7 - Indebtedness - Interest Expense on the Notes (Details) - The Notes [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Coupon interest expense at 1.375% $ 593 $ 593 $ 1,779 $ 1,779
Amortization of debt issuance costs 231 227 692 679
Total interest and amortization of debt issuance costs $ 824 $ 820 $ 2,471 $ 2,458