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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sales [Member] | Five Largest Customers [Member] |  |  |
Concentration Risk, Percentage | 40.00% | 42.00% | 41.00%
Sales [Member] | General Motors Company [Member] |  |  |
Concentration Risk, Percentage | 19.00% | 13.00% | 18.00%
Sales [Member] | Fiat Chrysler Automobiles [Member] |  |  |
Concentration Risk, Percentage | 9.00% | 16.00% | 10.00%
Sales [Member] | Ford Motor Company [Member] |  |  |
Concentration Risk, Percentage | 7.00% | 8.00% | 9.00%
Revenue Provided to the Automobile Manufacturing Industry [Member] |  |  |
Concentration Risk, Percentage | 40.00% | 46.00% | 46.00%
Accounts Receivable [Member] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 31,327,000 | $ 30,848,000 |

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- 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 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522 + Details
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