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Note 5 - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Restricted Cash and Cash Equivalents, Current, Total $ 8,128 $ 6,480
CHINA    
Certificates of Deposit, at Carrying Value 2,500 2,400
Bankers Acceptance [Member]    
Restricted Cash and Cash Equivalents, Current, Total 4,500 3,000
Guarantee Deposits for Customs Duties [Member]    
Restricted Cash and Cash Equivalents, Current, Total $ 1,100 $ 1,000