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Note 5 - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Restricted Cash and Cash Equivalents, Current $ 7,034 $ 10,902
CHINA    
Certificates of Deposit, at Carrying Value 1,900 1,100
Bankers Acceptance [Member]    
Restricted Cash and Cash Equivalents, Current 3,900 8,700
Guarantee Deposits for Customs Duties [Member]    
Restricted Cash and Cash Equivalents, Current $ 700 $ 1,000