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Note 10 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas Dividends (Details Textual) - Customer Concentration Risk [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sales [Member] | Five Largest Customers [Member]
Concentration Risk, Percentage	35.00%	40.00%	42.00%
Sales [Member] | General Motors Company [Member]
Concentration Risk, Percentage	15.00%	19.00%	13.00%
Sales [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk, Percentage	6.00%	9.00%	16.00%
Sales [Member] | Ford Motor Company [Member]
Concentration Risk, Percentage	5.00%	7.00%	8.00%
Revenue Provided to the Automobile Manufacturing Industry [Member]
Concentration Risk, Percentage	30.00%	40.00%	46.00%
Accounts Receivable [Member]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 25,593,000	$ 31,327,000

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Name Accounting Standards Codification
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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

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