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Note 17 - Business Segments (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2019 MWh
Number of Reportable Segments |  |  | 2
Share-based Payment Arrangement, Expense | $ 249 | $ 785 |
Restructuring Charges, Total | 0 | 310 |
Corporate, Non-Segment [Member] |  |  |
Share-based Payment Arrangement, Expense | $ 200 | 800 |
Restructuring Charges, Total |  | $ 300 |
Minimum [Member] |  |  |
Power of Wind Turbines | MWh |  |  | 2

X
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X
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