Note 1 - Nature of Operations, Basis of Presentation and Company Conditions (Details Textual)			3 Months Ended			12 Months Ended
	Jun. 11, 2022 GBP (£)	May 11, 2022 GBP (£)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Retained Earnings (Accumulated Deficit)			$ (507,286,000)			$ (487,121,000)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent			(20,257,000)		$ (36,670,000)
Net Cash Provided by (Used in) Operating Activities			775,000		(1,565,000)
Working Capital			(302,600,000)
Cash and Cash Equivalents, at Carrying Value			23,993,000		$ 20,949,000	21,489,000	$ 26,865,000
Sale of Equity, Registration, Maximum Value			64,000,000.0
Finance Lease, Impairment Loss				$ 4,500,000
Finance Lease, Future Payments			4,400,000
Goodwill			7,006,000			7,006,000
Accrued Liabilities, Current			45,198,000			39,065,000
Trade Names [Member]
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)						9,300,000
Customer Relationships [Member]
Impairment of Intangible Assets, Finite-Lived				4,300,000
Electric Power Segment [Member]
Goodwill, Impairment Loss				70,200,000
Goodwill			0			0
Telecommunications Segment [Member]
Goodwill, Impairment Loss				$ 25,800,000
Goodwill			0			0
Orbital Solar Services [Member]
Goodwill			$ 7.0			$ 7,000,000.0
Discontinued Operations, Disposed of by Sale [Member] | Orbital Gas Systems Limited [Member]
Disposal Group, Including Discontinued Operation, Consideration | £		£ 3,000,000
Proceeds from Divestiture of Businesses | £	£ 1,425,000	£ 1,575,000
Royalty Payment, Percent of Gross Sales		15.00%