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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jun. 12, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares) | 600,000 | 600,000 |
Sale of Stock, Underwriter Options, Shares (in shares) | 90,000 |  |
Shares Issued, Price Per Share (in dollars per share) | $ 225.00 |  |
Proceeds from Issuance of Common Stock | $ 145,935 | $ 145,935 | $ 84,995
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cumulative Effect of Adjustment, Vested in Period |  | 1,629 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cumulative Effect of Adjustment, Vested in Period, Net of Tax |  | $ 1,209 |
Share Based Compensation Effect on Earning per Share Basic (in dollars per share) |  | $ 0.25 |
Share-based Payment Arrangement, Expected Noncash Expense, Increased (Decrease) Per Quarter |  | $ 194 |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 1 year |

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