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Note 7 - Segment Reporting (Details Textual) $ in Thousands		3 Months Ended			9 Months Ended		12 Months Ended
		Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022
Number of Reportable Segments					2
Provision for Product Charges	[1]	$ 22,113		$ 55,265	$ 27,913	$ 55,265
Standard Product Warranty Accrual, Warranty Provision				$ 37,338
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage		79.00%		82.00%	77.00%	82.00%
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | UNITED STATES
Concentration Risk, Percentage					75.00%		77.00%
Product [Member]
Provision for Product Charges			$ 5,800,000
Clean Energy Product [Member]
Accounts Receivable, Credit Loss Expense (Reversal)				$ 17,926,000
Standard Product Warranty Accrual, Warranty Provision				$ 37,338,000
[1] The amount recorded in the third quarter 2023 represents a provision for judgments, estimates of pre-judgment interest and costs, and legal expenses related to certain patent lawsuits. The amount recorded in the first quarter 2023 represents a provision of $5.8 million for a matter with the Consumer Product Safety Commission (CPSC) concerning the imposition of civil fines for allegedly failing to timely submit a report under the Consumer Product Safety Act (CPSA) in relation to certain portable generators that were subject to a voluntary recall previously announced on July 29, 2021. The amount recorded in the third quarter of 2022 represents a specific bad debt provision of $17.9 million for a clean energy product customer that filed for bankruptcy as well as a warranty provision of $37.3 million to address certain clean energy product warranty-related matters.

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