Note 3 - Discontinued Operations and Sale of a Business - Schedule of Discontinued Operations for Income Statement and Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
(Provision) credit for bad debt	$ 0	$ (91)
Pretax loss from discontinued operations	(268)	(953)
Total loss from discontinued operations	(268)	(953)
Discontinued Operations, Held-for-Sale [Member]
Revenues	85	3,986
Cost of revenues	(191)	(2,694)
Selling, general and administrative expense	(162)	(2,139)
Interest expense	0	(7)
Other expense	0	(8)
Income tax expense	0	$ 0
Discontinued Operations, Held-for-Sale [Member] | Orbital Gas Systems Limited [Member]
Property and equipment	1,385
Other intangible assets	1,813
Total assets of the disposal group classified as held for sale	$ 3,198
Discontinued Operations, Held-for-Sale [Member] | Power and Electromechanical Business [Member]
Property and equipment			$ 1,385
Other intangible assets			1,813
Total assets of the disposal group classified as held for sale			$ 3,198