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Note 11 - Major Customers (Details Textual) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts [Member] | Customer Concentration Risk [Member] | US Government [Member] |  |  |
Concentration Risk, Percentage | 1.00% | 1.00% |
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts [Member] | Customer Concentration Risk [Member] | Customer A [Member] |  |  |
Concentration Risk, Percentage | 26.00% | 27.00% |
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts [Member] | Customer Concentration Risk [Member] | Customer B [Member] |  |  |
Concentration Risk, Percentage | 23.00% | 25.00% |
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts [Member] | Customer Concentration Risk [Member] | Customer C [Member] |  |  |
Concentration Risk, Percentage | 13.00% | 13.00% |
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts [Member] | Customer Concentration Risk [Member] | Customer D [Member] |  |  |
Concentration Risk, Percentage | 11.00% | 8.00% |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | US Government [Member] |  |  |
Concentration Risk, Percentage | 1.00% | 2.00% | 2.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer A [Member] |  |  |
Concentration Risk, Percentage | 30.00% | 22.00% | 26.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer B [Member] |  |  |
Concentration Risk, Percentage | 17.00% | 22.00% | 21.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer C [Member] |  |  |
Concentration Risk, Percentage | 13.00% | 19.00% |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer D [Member] |  |  |
Concentration Risk, Percentage | 12.00% | 11.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member] |  |  |
Concentration Risk, Percentage | 30.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member] |  |  |
Concentration Risk, Percentage | 18.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member] |  |  |
Concentration Risk, Percentage | 16.00% | 15.00% |
Number of Large Customers Contributed to Revenue of Entity | 4 | 4 |
Number of Large Customers Included in Accounts Receivable of Entity | 3 | 3 |
Number of Large Commercial Customers Accounted for Major Share in Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts | 4 | 4 |

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- Definition Represents number of large customers accounted for entity's major share of revenue during the reporting period. + References No definition available. + Details
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- Definition Represents number of large customers accounted for entity's major share of accounts receivable during the reporting period. + References No definition available. + Details
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- Definition Represents number of large commercial customers of the entity accounted for major share in costs and estimated earnings in excess of billings on uncompleted contracts. + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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