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Note 11 - Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 387,930 381,930 387,930 381,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 227,930 196,930 227,930 196,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0   0  
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0   0  
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total   34,410   33,748