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Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 12, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jan. 31, 2023	Dec. 31, 2022	Mar. 09, 2021
Revenue as Percentage of Sales Associated with New Wind Turbine Installations				51.00%	51.00%
Debt and Lease Obligation		$ 31,564		$ 31,564
Debt, Current		$ 21,374		$ 21,374
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001		$ 0.001			$ 0.001
Proceeds from Issuance of Common Stock, Net				$ 0	$ 230
Accounts Receivable, Sale		$ 12,084	$ 30,662	31,081	77,099
Accounts Receivable, Sale, Discount Fees		334	$ 615	649	$ 1,110
Long-Term Contract with Customer [Member]
Contract with Customer, Asset, before Allowance for Credit Loss						$ 175,000
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
The Sales Agreement [Member] | Maximum [Member]
Value of Shares Issuable, Maximum	$ 12,000
The 2022 Credit Facility [Member]
Line of Credit, Current		24,923		24,923
Revolving Credit Facility [Member]
Line of Credit, Current		6,405		6,405
Revolving Credit Facility [Member] | The 2022 Credit Facility [Member]
Line of Credit, Current		$ 18,518		$ 18,518

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Amount of discount fees on sale of accounts receivable.

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

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