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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended		18 Months Ended
	Sep. 12, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Mar. 09, 2021
Revenue as Percentage of Sales Associated with New Wind Turbine Installations				50.00%		53.00%
Debt and Lease Obligation		$ 25,434		$ 25,434		$ 25,434
Debt, Current		$ 14,700		$ 14,700		$ 14,700
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001		$ 0.001		$ 0.001	$ 0.001
Accounts Receivable, Sale		$ 9,495	$ 30,512	$ 18,807	$ 46,438
Accounts Receivable, Sale, Discount Fees		184	$ 417	315	$ 495
The ATM Agreement [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)								$ 0.001
The Sales Agreement [Member]
Sales Agent Commission Percentage	2.75%
Stock Issued During Period, Shares, New Issues (in shares)	100,379
Proceeds from Issuance of Common Stock, Net	$ 323
Payments of Stock Issuance Costs	9
Other Stock Issuance Expenses	93
Sale of Stock, Common Stock Available for Issuance, Value		11,667		11,667		$ 11,667
The Sales Agreement [Member] | Maximum [Member]
Value of Shares Issuable, Maximum	$ 12,000
The 2022 Credit Facility [Member]
Line of Credit, Current		18,666		18,666		18,666
Revolving Credit Facility [Member]
Line of Credit, Current		6,675		6,675		6,675
Revolving Credit Facility [Member] | The 2022 Credit Facility [Member]
Line of Credit, Current		$ 11,991		$ 11,991		$ 11,991

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