Note 7 - Shareholders' Equity - Schedule of Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Balance	$ 24,861	$ 24,193	$ 24,494	$ 24,164	$ 33,619	$ 35,112	$ 24,494	$ 35,112
Retirement benefits adjustment	19	20	19	17	12	13
Stock based compensation	9	113	63	37	33	41
Net loss	(496)	556	(383)	(204)	(9,500)	(1,547)	(323)	(11,252)
Purchase of treasury shares		(21)
Balance	24,393	24,861	24,193	24,013	24,164	33,619	24,393	24,013
Common Stock [Member]
Balance	525	525	525	524	523	523	525	523
Retirement benefits adjustment	0	0	0	0	0	0
Stock based compensation	0	0	0	1	1	0
Net loss	0	0	0	0	0	0
Purchase of treasury shares		0
Balance	525	525	525	525	524	523	525	525
Additional Paid-in Capital [Member]
Balance	14,762	14,661	14,617	14,587	14,573	14,556	14,617	14,556
Retirement benefits adjustment	0	0	0	0	0	0
Stock based compensation	34	101	44	16	14	17
Net loss	0	0	0	0	0	0
Purchase of treasury shares		0
Balance	14,796	14,762	14,661	14,603	14,587	14,573	14,796	14,603
Retained Earnings [Member]
Balance	13,127	12,571	12,954	12,694	22,194	23,741	12,954	23,741
Retirement benefits adjustment	0	0	0	0	0	0
Stock based compensation	0	0	0	0	0	0
Net loss	(496)	556	(383)	(205)	(9,500)	(1,547)
Purchase of treasury shares		0
Balance	12,631	13,127	12,571	12,489	12,694	22,194	12,631	12,489
AOCI Attributable to Parent [Member]
Balance	(2,350)	(2,370)	(2,389)	(2,312)	(2,324)	(2,337)	(2,389)	(2,337)
Retirement benefits adjustment	19	20	19	17	12	13
Stock based compensation	0	0	0	0	0	0
Net loss	0	0	0	0	0	0
Purchase of treasury shares		0
Balance	(2,331)	(2,350)	(2,370)	(2,295)	(2,312)	(2,324)	(2,331)	(2,295)
Employee Stock Ownership Trust Commitment [Member]
Balance	(56)	(56)	(56)	(157)	(157)	(157)	(56)	(157)
Retirement benefits adjustment	0	0	0	0	0	0
Stock based compensation	0	0	0	0	0	0
Net loss	0	0	0	0	0	0
Purchase of treasury shares		0
Balance	(56)	(56)	(56)	(157)	(157)	(157)	(56)	(157)
Treasury Stock, Common [Member]
Balance	(1,147)	(1,138)	(1,157)	(1,172)	(1,190)	(1,214)	(1,157)	(1,214)
Retirement benefits adjustment	0	0	0	0	0	0
Stock based compensation	(25)	12	19	20	18	24
Net loss	0	0	0	0	0	0
Purchase of treasury shares		(21)
Balance	$ (1,172)	$ (1,147)	$ (1,138)	$ (1,152)	$ (1,172)	$ (1,190)	$ (1,172)	$ (1,152)