Note 8 - Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024
Balance	$ 208,047	$ 216,331	$ 224,510	$ 227,483
Stock-based compensation	607	563	621	614
Tongmei stock-based compensation	24	77	86	184
Net loss	(7,241)	(9,408)	(1,200)	(1,977)
Other comprehensive loss	1,184	484	(670)	(1,814)
Balance	202,621	208,047	223,352	224,510
Common stock options exercised			5	20
Preferred Stock [Member]
Balance	3,532	3,532	3,532	3,532
Stock-based compensation	0	0	0	0
Tongmei stock-based compensation	0	0	0	0
Net loss	0	0	0	0
Other comprehensive loss	0	0	0	0
Balance	3,532	3,532	3,532	3,532
Common stock options exercised			0	0
Common Stock [Member]
Balance	46	45	44	44
Stock-based compensation	0	0	0	0
Tongmei stock-based compensation	0	1	0	0
Net loss	0	0	0	0
Other comprehensive loss	0	0	0	0
Balance	46	46	44	44
Common stock options exercised			0	0
Additional Paid-in Capital [Member]
Balance	242,147	241,514	239,257	238,452
Stock-based compensation	607	563	621	614
Tongmei stock-based compensation	22	70	79	171
Net loss	0	0	0	0
Other comprehensive loss	0	0	0	0
Balance	242,776	242,147	239,962	239,257
Common stock options exercised			5	20
Retained Earnings [Member]
Balance	(52,462)	(43,664)	(34,123)	(32,040)
Stock-based compensation	0	0	0	0
Tongmei stock-based compensation	0	0	0	0
Net loss	(7,008)	(8,798)	(1,516)	(2,083)
Other comprehensive loss	0	0	0	0
Balance	(59,470)	(52,462)	(35,639)	(34,123)
Common stock options exercised			0	0
AOCI Attributable to Parent [Member]
Balance	(8,226)	(8,657)	(7,626)	(5,999)
Stock-based compensation	0	0	0	0
Tongmei stock-based compensation	0	0	0	0
Net loss	0	0	0	0
Other comprehensive loss	1,056	431	(601)	(1,627)
Balance	(7,170)	(8,226)	(8,227)	(7,626)
Common stock options exercised			0	0
Parent [Member]
Balance	185,037	192,770	201,084	203,989
Stock-based compensation	607	563	621	614
Tongmei stock-based compensation	22	71	79	171
Net loss	(7,008)	(8,798)	(1,516)	(2,083)
Other comprehensive loss	1,056	431	(601)	(1,627)
Balance	179,714	185,037	199,672	201,084
Common stock options exercised			5	20
Noncontrolling Interest [Member]
Balance	23,010	23,561	23,426	23,494
Stock-based compensation	0	0	0	0
Tongmei stock-based compensation	2	6	7	13
Net loss	(233)	(610)	316	106
Other comprehensive loss	128	53	(69)	(187)
Balance	$ 22,907	$ 23,010	23,680	23,426
Common stock options exercised			$ 0	$ 0