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Note E - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Restricted Cash and Cash Equivalents, Current, Total $ 6,480 $ 6,689
CHINA    
Certificates of Deposit, at Carrying Value 2,400 500
Bankers Acceptance [Member]    
Restricted Cash and Cash Equivalents, Current, Total 3,000 4,900
Guarantee Deposits for Customs Duties [Member]    
Restricted Cash and Cash Equivalents, Current, Total $ 1,000 $ 1,000