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Note 11 - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 29, 2021	Mar. 31, 2022	Dec. 31, 2021	Apr. 05, 2021
Chailease Finance Co, Ltd. [Member] | Promissory Note [Member]
Long-term debt, maturity date		Jan. 21, 2022	Jan. 21, 2022
Long-term debt, interest		3.10%	3.10%
Revolving Credit Facility [Member] | Truist Bank [Member]
Long-term debt, maximum (USD)				$ 20,000
Revolving Credit Facility [Member] | Truist Bank [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Long-term debt, interest	1.56%
Revolving Credit Facility [Member] | Truist Bank [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Sixth Amendment to Loan Agreement with Truist Bank [Member]
Long-term debt, maximum (USD)		$ 20,000	$ 20,000
Long-term debt, interest		1.56%	1.56%
Long-term debt, maturity date		Apr. 15, 2023	Apr. 15, 2023
Revolving Credit Facility [Member] | SPD Bank [Member]
Long-term debt, maximum (USD)		$ 25,449	$ 25,449
Long-term debt, maturity date		May 24, 2024	May 24, 2024
Revolving Credit Facility [Member] | SPD Bank [Member] | Minimum [Member]
Long-term debt, interest		2.80%	2.80%
Revolving Credit Facility [Member] | SPD Bank [Member] | Maximum [Member]
Long-term debt, interest		4.57%	4.57%
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member]
Long-term debt, maximum (USD)		$ 14,125	$ 14,125
Long-term debt, maturity date		Jan. 05, 2024	Jan. 05, 2024
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member] | Minimum [Member]
Long-term debt, interest		2.60%	2.60%
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥100M Credit Facility [Member] | Maximum [Member]
Long-term debt, interest		4.50%	4.50%
Revolving Credit Facility [Member] | China Zheshang Bank Co., Ltd [Member] | The ¥50M Credit Facility [Member]
Long-term debt, maximum (USD)		$ 7,167	$ 7,167
Long-term debt, maturity date		Jun. 27, 2022	Jun. 27, 2022
Long-term debt, interest		5.70%	5.70%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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
-Paragraph 1B
-Subparagraph (b)
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-Topic 210
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-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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