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Note 12 - Stock Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       1 year 109 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 440,000   $ 440,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       1 year 109 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   431,000   $ 431,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   5,000   5,000    
Allocated Share-based Compensation Expense   7,000 $ 24,000 $ 28,000 $ 92,000  
Scenario, Forecast [Member] | Arvest Bank [Member] | Merger With Arvest [Member]            
Business Acquisition, Share Price           $ 10.28
Employee Stock Option [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       73 days    
Restricted Stock Units (RSUs) [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 146 days    
Allocated Share-based Compensation Expense   210,000 254,000 $ 717,000 940,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   968,000   968,000    
Performance Shares [Member]            
Allocated Share-based Compensation Expense   $ 61,000 $ 8,000 $ 91,000 $ 23,000  
Percentage of Cash Payment for Awards If a Change in Control   100.00%   100.00%    
Two Thousand Eleven Omnibus Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   2,144,743   2,144,743    
Share-based Compensation Award Term       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period       5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term       7 years    
Two Thousand Eleven Omnibus Incentive Plan [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Share-based Compensation Award, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Minimum [Member]            
Performance Award Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 0.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Maximum [Member]            
Performance Award Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 40.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Two Thousand Eleven Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years    
Two Thousand Eleven Omnibus Incentive Plan [Member] | Cash [Member]            
Performance Award Plan, Matched Amount, by Type of Award 25.00%          
Two Thousand Eleven Omnibus Incentive Plan [Member] | Restricted Stock [Member]            
Performance Award Plan, Matched Amount, by Type of Award 75.00%