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Note 7 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement, Expense $ 598,000 $ 579,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based Payment Arrangement, Expense $ 208,000 $ 120,000