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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 09, 2021	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Jan. 31, 2022	Dec. 31, 2021
Revenue as Percentage of Sales Associated with New Wind Turbine Installations		53.00%		63.00%
Debt and Lease Obligation, Total		$ 19,988
Debt, Current, Total		16,105
Proceeds from Issuance of Common Stock, Net		$ 0		$ 6,101
Receivable, Uncollected Employee Retention Credit							$ 497
Collected, Employee Retention Credit						$ 497
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	$ 411

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