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Note 11 - Employee Benefit Plan (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 47,000 $ 78,000