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Note 13 - Significant Risks and Uncertainties (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer A [Member] |  |
Concentration Risk, Percentage | 49.60% | 50.20%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer B [Member] |  |
Concentration Risk, Percentage | 13.70% |
Cash, Uninsured Amount | $ 11,966,000 | $ 10,216,000
Number Of Major Customers | 1 | 1
Export Sales To Unaffiliated Customers As Percentage Of Total Sales | 9.00% | 20.20%

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