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Note J - Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Cash and cash equivalents $ 34,656 $ 43,425
Restricted cash 6,480 6,689
Note receivable 8,148 401
Total assets 49,284 50,515
Bank acceptance payable 8,198 15,860
Convertible senior notes 67,588 70,225
Total liabilities 75,786 86,085
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 34,656 43,425
Restricted cash 6,480 6,689
Note receivable 0 0
Total assets 41,136 50,114
Bank acceptance payable 0 0
Convertible senior notes 0 0
Total liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Note receivable 8,148 401
Total assets 8,148 401
Bank acceptance payable 8,198 15,860
Convertible senior notes 67,588 70,225
Total liabilities 75,786 86,085
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Note receivable 0 0
Total assets 0 0
Bank acceptance payable 0 0
Convertible senior notes 0 0
Total liabilities $ 0 $ 0