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Note 11 - Concentrations (Details Textual) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Number of Areas in Which Operations are Concentrated | 1 |
Concentration Risk, Threshold Percentage | 30.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | U.S. Government [Member] |  |
Concentration Risk, Percentage | 69.30% | 54.70%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Government Customers [Member] |  |
Concentration Risk, Percentage | 49.70% | 43.90%
Number of Major Customers | 3 | 3

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- Definition The threshold percentage that is used to determine if there is a concentration risk. + References No definition available. + Details
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- Definition Represents the number of areas in which operations of the entity are concentrated. + 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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611 + Details
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