Note 19 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	12 Months Ended			252 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 1994
Purchase Commitment, Remaining Minimum Amount Committed	$ 57.7	$ 113.4
Arezzo Revenue Agency [Member]
Loss Contingency, Estimate of Possible Loss		12.0
EOS Claim From Principal Commissioner of Customs [Member] | EOS Power Panama Inc. [Member]
Customs Duties and Imposed Fines			$ 0.9		$ 1.4
Payment for Customs Duties and Imposed Fines and Penalties				$ 0.5
Indemnification Period (Year)			7 years
Capital Addition Purchase Commitments [Member]
Long-Term Purchase Commitment, Amount	$ 5.8	$ 7.8