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Note K - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term debt	$ 54,711	$ 52,187
Less debt issuance costs, net	22	18
Grand total	54,689	52,169
Less current portion	49,689	38,265
Non-current portion	5,000	13,904
Bank acceptance notes issued to vendors with a zero percent interest rate	8,198	15,860
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term debt	0	1,941
Chailease Finance Co, Ltd. [Member] | Promissory Note 2 [Member]
Long-term debt	170	2,149
Paycheck Protection Program, CARES Act [Member]
Long-term debt	0	6,229
Truist Bank [Member] | Revolving Credit Facility [Member] | Fouth Amendment to Loan Agreement with Truist Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Long-term debt	0	18,700
Truist Bank [Member] | Revolving Credit Facility [Member] | Sixth Amendment to Loan Agreement with Truist Bank [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Long-term debt	14,373	0
Taishin International Bank [Member] | Revolving Credit Facility [Member] | Credit Facility [Member]
Long-term debt	0	1,756
China Merchants Bank Co, Ltd [Member] | Revolving Credit Facility [Member]
Long-term debt	0	2,299
SPD Bank [Member] | Revolving Credit Facility [Member]
Long-term debt	19,595	11,603
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥100M Credit Facility [Member]
Long-term debt	13,044	0
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥50M Credit Facility [Member]
Long-term debt	$ 7,529	$ 7,510

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