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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 13, 2020 USD ($) | Apr. 30, 2020 USD ($) | Jul. 31, 2018 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  |  | 3 |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |  |  | $ 3,372 |  |  |  | $ 2,416 |  |  |  | $ 3,372 | $ 2,416
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total |  |  |  |  |  |  |  |  |  |  |  | 956 | $ 1,239
Debt and Lease Obligation, Total |  |  |  | 14,210 |  |  |  |  |  |  |  | 14,210 |
Debt, Current, Total |  |  |  | $ 2,833 |  |  |  |  |  |  |  | $ 2,833 |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |  |  |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  |  |  |  |  |  |  | $ 232 |
Interest Income, Other |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | $ 40,322 | $ 54,614 | $ 54,926 | $ 48,634 | $ 49,253 | $ 46,138 | $ 41,169 | $ 41,660 | 198,496 | 178,220
Depreciation, Total |  |  |  |  |  |  |  |  |  |  |  | $ 5,546 | $ 5,814
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  |  |  |  | 5 | 5
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Five Largest Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  | 65.00% | 55.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  |  |  |  | 5 | 5
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Five Largest Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  | 78.00% | 79.00%
Transferred over Time [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  |  |  | $ 2,253 | $ 0
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 9,530 |  |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt | $ 379 |  |  |  |  |  |  |  |  |  |  |  |
The ATM Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Value of Shares Issuable, Maximum |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Sales Agent Commission Percentage |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 91,481 | 0
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  |  |  |  |  |  |  | $ 321 |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  |  |  |  | 10 |
Other Stock Issuance Expenses |  |  |  |  |  |  |  |  |  |  |  | 89 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 20,678 |  |  |  |  |  |  |  | 20,678 |
Line of Credit, Current |  |  |  | $ 1,245 |  |  |  |  |  |  |  | $ 1,245 |
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 |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Heavy Fabrications [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Tower Production Capacity |  |  |  |  |  |  |  |  |  |  |  | 550 |
Heavy Fabrications [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Power Generating Capacity of Turbines |  |  |  |  |  |  |  |  |  |  |  | 1,100 |

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