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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 01, 2021 | Mar. 09, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Revenue as Percentage of Sales Associated with New Wind Turbine Installations |  |  |  |  |  | 68.00% | 72.00% |
Debt and Lease Obligation, Total |  |  | $ 11,079 |  |  | $ 11,079 |  |
Debt, Current, Total |  |  | 8,193 |  |  | 8,193 |  |
Long-term Debt, Total |  |  | 228 |  |  | 228 |  | $ 228
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  | 9,349 | $ 0 |
Employee Retention Credit Benefit | $ 1,879 |  |  |  |  |  |  |
Employee Retention Credit Receivable, Current | $ 1,714 |  | 1,714 |  |  | 1,714 |  | 0
Gain (Loss) on Extinguishment of Debt, Total |  |  | 9,151 |  | $ 0 | $ 9,151 | $ 0 |
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 |  | $ 376 |  |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  | 0 |  |  | $ 0 |  | $ 9,151
Gain (Loss) on Extinguishment of Debt, Total |  |  | $ 9,151 |  |  |  |  |

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