Note 2 - Summary of Significant Accounting Policies - Revenues Disaggregated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues from external customers	$ 82,948	$ 21,487
North America [Member]
Revenues from external customers	80,595	21,487
Other Regions [Member]
Revenues from external customers	2,353
Telecommunications Segment [Member]
Revenues from external customers	27,799	0
Telecommunications Segment [Member] | North America [Member]
Revenues from external customers	25,446	0
Telecommunications Segment [Member] | Other Regions [Member]
Revenues from external customers	2,353
Electric Power Segment [Member]
Revenues from external customers	43,599	8,482
Electric Power Segment [Member] | North America [Member]
Revenues from external customers	43,599	8,482
Electric Power Segment [Member] | Other Regions [Member]
Revenues from external customers	0
Renewables Segment [Member]
Revenues from external customers	11,550	13,005
Renewables Segment [Member] | North America [Member]
Revenues from external customers	11,550	13,005
Renewables Segment [Member] | Other Regions [Member]
Revenues from external customers	0
Transferred at Point in Time [Member]
Revenues from external customers	1,812	0
Transferred at Point in Time [Member] | Telecommunications Segment [Member]
Revenues from external customers	1,812	0
Transferred at Point in Time [Member] | Electric Power Segment [Member]
Revenues from external customers	0	0
Transferred at Point in Time [Member] | Renewables Segment [Member]
Revenues from external customers	0	0
Transferred over Time [Member]
Revenues from external customers	81,136	21,487
Transferred over Time [Member] | Telecommunications Segment [Member]
Revenues from external customers	25,987	0
Transferred over Time [Member] | Electric Power Segment [Member]
Revenues from external customers	43,599	8,482
Transferred over Time [Member] | Renewables Segment [Member]
Revenues from external customers	$ 11,550	$ 13,005