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Note 11 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Details Textual) - Customer Concentration Risk [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sales Revenue, Services, Net [Member] | Five Largest Customers [Member]
Concentration Risk, Percentage	42.00%	41.00%	43.00%
Sales Revenue, Services, Net [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk, Percentage	16.00%	10.00%	9.00%
Sales Revenue, Services, Net [Member] | General Motors Company [Member]
Concentration Risk, Percentage	13.00%	18.00%	18.00%
Sales Revenue, Services, Net [Member] | Ford Motor Company [Member]
Concentration Risk, Percentage	8.00%	9.00%	10.00%
Revenue Provided to the Automobile Manufacturing Industry [Member]
Concentration Risk, Percentage	46.00%	46.00%	45.00%
Accounts Receivable [Member]
Accounts Receivable, Gross, Current	$ 30,848,000	$ 29,788,000

X

- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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