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Note 7 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allocated Share-based Compensation Expense, Total $ 307,000 $ 253,000 $ 1,206,000 $ 1,065,000
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Allocated Share-based Compensation Expense, Total     $ 402,000 $ 327,000