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Note 9 - Significant Customers and Industry Concentration (Details Textual) - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013
Sales Revenue, Services, Net [Member] |  |  |
Number of Greater than Ten Percent of Revenue Customers | 3 | 2 | 2
Concentration Risk, Percentage | 37.00% | 34.00% | 33.00%
Accounts Receivable [Member] |  |  |
Number of Greater than Ten Percent of Revenue Customers | 3 | 3 |
Accounts Receivable, Gross, Current | $ 27,051,000 | $ 28,297,000 |
Revenue Provided to the Automobile Manufacturing Industry [Member] |  |  |
Concentration Risk, Percentage | 47.00% | 48.00% | 46.00%

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- 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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