Note 18 - Business Segments - Revenues as Reported in the Geographic Area (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	[1]	$ 663,084	$ 705,342	$ 746,044
UNITED STATES
Revenue	[1],[2]	440,110	363,023	377,956
INDONESIA
Revenue	[1]	8,056	0	0
KENYA
Revenue	[1]	102,844	115,474	121,661
TURKEY
Revenue	[1]	2,723	65,535	88,938
CHILE
Revenue	[1]	7,035	32,418	25,540
GUATEMALA
Revenue	[1]	26,868	27,391	28,624
NEW ZEALAND
Revenue	[1]	6,770	34,985	31,222
HONDURAS
Revenue	[1]	35,233	35,197	34,446
Other Foreign Countries [Member]
Revenue	[1]	$ 33,445	$ 31,319	$ 37,657

[1] Revenues as reported in the geographic area in which they originate.

[2] Electricity segment revenues in the United States are all accounted under lease accounting, except for $83.4 million, $68.1 million and $61.3 million for the years 2021, 2020 and 2019, which are accounted under ASC 606. Product and Energy Storage segment revenues in the United States are accounted under ASC 606, as further described under Note 1 to the consolidated financial statements.