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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Apr. 01, 2021 USD ($) | Mar. 31, 2021 USD ($)
Number of Operating Segments | 4 |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ 82,199 |  | $ 72,459
Accounting Standards Update 2020-06 [Member] |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  | $ (22,735) |
Deferred Tax Liabilities, Deferred Expense, Debt |  | (5,747) |
Convertible Debt, Total |  | 22,799 |
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ 5,683 |

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