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Note 10 - Equity Incentive Plan (Details Textual)
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Common Stock, Dividends, Per Share, Cash Paid | $ / shares   $ 0
The 2017 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 97,524 97,524
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   60,080
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 14.09 $ 14.09
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 184,000 $ 184,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Fair Value | $ $ 184,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ $ 0 $ 0
The 2017 Equity Incentive Plan [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 69,660 69,660
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 60,080  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years  
Allocated Share-based Compensation Expense | $ $ 0  
The 2017 Equity Incentive Plan [Member] | Restricted Stock Awards, Restricted Stock Units and Unrestricted Share Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 27,864 27,864
The 2017 Equity Incentive Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 22,931 22,931
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ $ 323,000 $ 323,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years  
Allocated Share-based Compensation Expense | $   $ 0