Note 3 - Discontinued Operations - Financial Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Oct. 06, 2022	Dec. 31, 2023	Dec. 31, 2022
(Loss) income from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ (28)	$ 132	$ 488	$ 457	$ 808		$ (28)	$ 1,885
Disposal Group, Not Discontinued Operations [Member] | MtronPTI [Member]
Net sales										0	23,529
Total revenues										0	23,529
Manufacturing cost of sales										0	15,164
Engineering, selling and administrative										28	5,870
Total expenses										28	21,034
Operating (loss) income										(28)	2,495
Interest expense, net										0	(6)
Other expense, net										0	(44)
(Loss) income from discontinued operations before income taxes										(28)	2,445
Income tax provision										0	560
(Loss) income from discontinued operations, net of tax										$ (28)	$ 1,885
Depreciation									$ 496
Amortization of finite-lived intangible assets									42
Stock-based compensation expense									26
Capital expenditures									$ (662)