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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 09, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue as Percentage of Sales Associated with New Wind Turbine Installations							66.00%	72.00%
Debt and Lease Obligation, Total		$ 10,321					$ 10,321
Debt, Current, Total		7,331					7,331
Long-term Debt, Total		228					228		$ 228
Proceeds from Issuance of Common Stock, Net							9,329	$ 232
Gain (Loss) on Extinguishment of Debt, Total		0			$ 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	$ 396
Paycheck Protection Program CARES Act [Member]
Long-term Debt, Total		0					$ 0		$ 9,151
Gain (Loss) on Extinguishment of Debt, Total		$ 9,151	$ 9,151

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