Note 4 - Property, Plant and Equipment, Net (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Construction in Progress, Gross	$ 21,587	$ 23,531
Dingxing and Kazuo [Member]
Construction in Progress, Gross		17,900
Manufacturing Equipment [Member]
Construction in Progress, Gross	1,200	1,400
Construction in Progress, Other Consolidated Subsidiaries [Member]
Construction in Progress, Gross	3,800	$ 4,300
Dingxing and Kazuo [Member]
Construction in Progress, Gross	$ 16,500