Note 7 - Segment Reporting (Details Textual) $ in Thousands		3 Months Ended			9 Months Ended		12 Months Ended
		Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023
Number of Reportable Segments					2
Provision for Product Charges	[1]	$ (2,382)		$ (22,113)	$ (5,280)	$ (27,913)
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage		83.00%		79.00%	79.00%	77.00%
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | UNITED STATES
Concentration Risk, Percentage					75.00%		74.00%
Patents and Securites [Member]
Provision for Product Charges		$ 2,382		$ 22,113	$ 4,915
Clean Energy Product [Member]
Provision for Product Charges			$ 365
Product [Member]
Provision for Product Charges			$ 5,800

[1] Represents the following significant and unusual charges not indicative of our ongoing operations: • A provision for judgments and legal expenses related to certain patent and securities lawsuits - $2,382 in the third quarter of 2024; $4,915 year-to-date 2024; and $22,113 in the third quarter of 2023. • Additional customer support costs related to a clean energy product customer that filed for bankruptcy in 2022 – $365 in the first quarter of 2024. • A provision 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 - $5,800 in the first quarter of 2023.