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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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