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Note 5 - Common Stock Options (Details Textual) - The Plan [Member]
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Any One Person [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 5.00%
Share-based Payment Arrangement, Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 4.9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 204 days