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v3.21.1

Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 09, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Revenue as Percentage of Sales Associated with New Wind Turbine Installations |  | 63.00% | 74.00% |
Debt and Lease Obligation, Total |  | $ 17,803 |  |
Debt, Current, Total |  | 6,532 |  |
Line of Credit, Current |  | 4,468 |  |
Long-term Debt, Excluding Current Maturities, Total |  | $ 9,380 |  | $ 9,381
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 |  | $ 0.001
Proceeds from Issuance of Common Stock, Net |  | $ 6,101 |  |
Employee Retention Credit Receivable, Current |  | 3,372 |  |
Nonoperating Income (Expense) [Member] |  |  |  |
Employee Retention Credit Benefit |  | 3,372 |  |
The ATM Agreement [Member] |  |  |  |
Value of Shares Issuable, Maximum | $ 10,000 |  |  |
Sales Agent Commission Percentage | 2.75% |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,100,000 |  |  |
Proceeds from Issuance of Common Stock, Net | $ 6,436 |  |  |
Payments of Stock Issuance Costs | $ 182 |  |  |
Other Stock Issuance Expenses |  | 335 |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |
Long-term Debt, Excluding Current Maturities, Total |  | $ 9,151 |  |

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