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Note 10 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Details Textual) - Customer Concentration Risk [Member] - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Sales [Member] | Five Largest Customers [Member]
Concentration Risk, Percentage	34.00%	39.00%	33.00%
Sales [Member] | General Motors Company [Member]
Concentration Risk, Percentage	12.00%	13.00%	11.00%
Revenue Provided to the Automobile Manufacturing Industry [Member] | Other Manufacturers [Member]
Concentration Risk, Percentage	30.00%	31.00%	27.00%
Accounts Receivable [Member]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 24,665,000	$ 36,622,000

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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