Note L - Restructuring of Operations (Details Textual) Pure in Thousands, $ in Thousands	3 Months Ended					88 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 25, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 24, 2021 USD ($)	Sep. 30, 2022 USD ($)
Restructuring Reserve, Ending Balance	$ 956	$ 1,024				$ 956
Restructuring Charges, Total	11				$ 48
Proceeds from Sale of Property, Plant, and Equipment, Total	2				9,139
Gain (Loss) on Disposition of Assets, Total	42				2,939
Property, Plant, and Equipment Reclassified to Assets Held for Sale [Member]
Increase (Decrease) in Assets Held-for-sale	2,801
Propeller Machining Plant and Office in Switzerland [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 305		$ 9,138
Propeller Machining Plant and Office in Switzerland [Member] | Other Operating Income (Expense) [Member]
Gain (Loss) on Disposition of Assets, Total				$ 2,939
Employee Severance [Member]
Restructuring Reserve, Ending Balance	2,200					2,200
Restructuring Charges, Total	$ 11				$ 448	$ 16,229
Restructuring and Related Cost, Number of Positions Eliminated						254
Impairment of Long-Lived Assets to be Disposed of			$ 4,267