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Note 7 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024
Number of Reportable Segments			2
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	80.00%	83.00%	79.00%	79.00%
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | UNITED STATES
Concentration Risk, Percentage			74.00%		76.00%
Clean Energy Product [Member]
Provision for Product Charges		$ 0		$ 365
Certain Patent Lawsuits [Member]
Legal Fees	$ 2,736	$ 2,382	$ 5,923	$ 4,915
Multi-district Class Action Lawsuit [Member]
Legal Fees			15,000
Class Action Lawsuits [Member]
Legal Fees	17,759		21,643
Government Inquiries and Other Matters [Member]
Legal Fees	$ 2,713		$ 4,304

X

- Definition

Represents a specific credit loss provision for a clean energy product customer that filed for bankruptcy, as well as a warranty provision to address certain clean energy product warranty-related matters

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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