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Note 13 - Significant Risks and Uncertainties (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Cash, Uninsured Amount | $ 20,157,000 | $ 11,966,000
Export Sales To Unaffiliated Customers As Percentage Of Total Sales | 11.90% | 9.00%
Number Of Major Customers | 1 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer A [Member] |  |
Concentration Risk, Percentage | 45.30% | 49.60%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer B [Member] |  |
Concentration Risk, Percentage |  | 13.70%

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