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Note 4 - Stock-based Compensation (Details Textual) - Restricted Stock Plan [Member] - Restricted Stock [Member]
3 Months Ended
Mar. 31, 2018
USD ($)
shares
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ $ 145,345
Executive Officers, Non-employee Directors and Other Key Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 4 years