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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 09, 2021 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Jan. 31, 2022 | Dec. 31, 2021
Revenue as Percentage of Sales Associated with New Wind Turbine Installations |  | 53.00% |  | 63.00% |  |  |
Debt and Lease Obligation, Total |  | $ 19,988 |  |  |  |  |
Debt, Current, Total |  | 16,105 |  |  |  |  |
Proceeds from Issuance of Common Stock, Net |  | $ 0 |  | $ 6,101 |  |  |
Receivable, Uncollected Employee Retention Credit |  |  |  |  |  |  | $ 497
Collected, Employee Retention Credit |  |  |  |  |  | $ 497 |
Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |
Employee Retention Credit Benefit |  |  | $ 3,593 | $ 3,372 |  |  |
The ATM Agreement [Member] |  |  |  |  |  |  |
Value of Shares Issuable, Maximum | $ 10,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 1,897,697 |  |
Proceeds from Issuance of Common Stock, Net | 9,725 |  |  |  |  |  |
Payments of Stock Issuance Costs | 275 |  |  |  |  |  |
Other Stock Issuance Expenses | $ 411 |  |  |  |  |  |

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