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Note 7 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Expense $ 374,000 $ 307,000   $ 1,346,000 $ 1,206,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share-based Payment Arrangement, Expense       $ 511,000 $ 402,000