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Note 13 - Significant Risks and Uncertainties (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Cash, Uninsured Amount | $ 12,198,000 | $ 20,157,000
Export Sales To Unaffiliated Customers As Percentage Of Total Sales | 9.60% | 11.90%
Number Of Major Customers | 1 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer A [Member] |  |
Concentration Risk, Percentage | 66.10% | 45.30%

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