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Note K - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - USD ($)			12 Months Ended
	Dec. 29, 2021	Apr. 05, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Mar. 05, 2019
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term debt, maturity date			Jan. 21, 2022	Jan. 21, 2022
Long-term debt, interest			3.50%	3.50%
Chailease Finance Co, Ltd. [Member] | Promissory Note 2 [Member]
Long-term debt, maturity date			Jan. 21, 2022	Jan. 21, 2022
Long-term debt, interest			3.10%	3.10%
Paycheck Protection Program, CARES Act [Member]
Long-term debt, maturity date			Apr. 16, 2022	Apr. 16, 2022
Long-term debt, interest			1.00%	1.00%
Truist Bank [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum	$ 20,000,000	$ 20,000,000			$ 20,000,000	$ 25,000,000
Truist Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Long-term debt, interest		1.50%
Truist Bank [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Long-term debt, interest	1.56%
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, maximum			$ 20,000,000	$ 20,000,000
Long-term debt, interest			1.50%	1.50%
Long-term debt, maturity date			Apr. 02, 2021	Apr. 02, 2021
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, maximum			$ 20,000,000	$ 20,000,000
Long-term debt, interest			1.56%	1.56%
Long-term debt, maturity date			Apr. 15, 2023	Apr. 15, 2023
Taishin International Bank [Member] | Revolving Credit Facility [Member] | Credit Facility [Member]
Long-term debt, maximum			$ 3,436,000	$ 3,436,000
Long-term debt, maturity date			Jan. 31, 2021	Jan. 31, 2021
Long-term debt, interest			2.20%	2.20%
China Merchants Bank Co, Ltd [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum			$ 8,917,000	$ 8,917,000
Long-term debt, maturity date			Oct. 15, 2021	Oct. 15, 2021
Long-term debt, interest			4.50%	4.50%
SPD Bank [Member] | Revolving Credit Facility [Member]
Long-term debt, maximum			$ 25,449,000	$ 25,449,000
Long-term debt, maturity date			May 24, 2024	May 24, 2024
SPD Bank [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long-term debt, interest			3.01%	3.01%
SPD Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long-term debt, interest			4.57%	4.57%
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥100M Credit Facility [Member]
Long-term debt, maximum			$ 14,125,000
Long-term debt, maturity date			Jan. 01, 2024
Long-term debt, interest			3.50%
China Zheshang Bank Co., Ltd [Member] | Revolving Credit Facility [Member] | The ¥50M Credit Facility [Member]
Long-term debt, maximum			$ 7,167,000	$ 7,167,000
Long-term debt, maturity date			Jun. 20, 2022	Jun. 20, 2022
Long-term debt, interest			5.70%	5.70%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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