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Note 15 - Business Segments (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Boe | Sep. 30, 2019 USD ($)
Number of Reportable Segments |  |  | 2 |
Share-based Payment Arrangement, Expense | $ 849 | $ 397 | $ 1,758 | $ 646
Corporate, Non-Segment [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 800 | $ 400 | $ 1,800 | $ 600
Minimum [Member] |  |  |  |
Number of Reportable Segments (Barrel of Oil Equivalent) | Boe |  |  | 2 |

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