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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 09, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2021 shares | Dec. 31, 2021 USD ($) MWh | Dec. 31, 2020 USD ($) | Jan. 31, 2022 USD ($)
Number of Reportable Segments |  |  |  |  | 3 |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  |  |  | $ 852 | $ 3,372 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total |  |  |  |  | (2,520) | 956 |
Debt and Lease Obligation, Total |  |  |  |  | 11,368 |  |
Debt, Current, Total |  |  |  |  | 8,710 |  |
Line of Credit, Current |  |  |  |  | 6,350 |  |
Proceeds from Issuance of Common Stock, Net |  |  |  |  | 9,314 | 232 |
Employee Retention Credit Benefit |  | $ 3,593 | $ 3,372 |  |  |  |
Receivable, Uncollected Employee Retention Credit |  |  |  |  | 497 |  |
Interest Income, Other |  |  |  |  | 1 | 0 |
Depreciation, Total |  |  |  |  | $ 5,603 | $ 5,546 |
Customer Concentration Risk [Member] |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  | 5 | 5 |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Five Largest Customers [Member] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 71.00% | 78.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Five Largest Customers [Member] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 25.00% | 65.00% |
Subsequent Event [Member] |  |  |  |  |  |  |
Collected, Employee Retention Credit |  |  |  |  |  |  | $ 497
The ATM Agreement [Member] |  |  |  |  |  |  |
Value of Shares Issuable, Maximum | $ 10,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  |  | 1,897,697 |  |  |
Proceeds from Issuance of Common Stock, Net | 9,725 |  |  |  |  |  |
Payments of Stock Issuance Costs | 275 |  |  |  |  |  |
Other Stock Issuance Expenses | $ 411 |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 14,037 |  |
Maximum [Member] |  |  |  |  |  |  |
Product Warranty Term (Year) |  |  |  |  | 5 years |  |
Minimum [Member] |  |  |  |  |  |  |
Product Warranty Term (Year) |  |  |  |  | 1 year |  |
Heavy Fabrications [Member] |  |  |  |  |  |  |
Number of Facilities |  |  |  |  | 2 |  |
Number of Tower Sections in Production Capacity of Turbines Total |  |  |  |  | 1,650 |  |
Heavy Fabrications [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  | 2 | 1 |
Heavy Fabrications [Member] | Maximum [Member] |  |  |  |  |  |  |
Annual Tower Production Capacity |  |  |  |  | 550 |  |
Heavy Fabrications [Member] | Minimum [Member] |  |  |  |  |  |  |
Power Generating Capacity of Turbines (Megawatt-Hour) | MWh |  |  |  |  | 1,100 |  |

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