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Note 14 - Stock Based Compensation (Details Textual) - USD ($)
12 Months Ended 72 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross        
Scenario, Forecast [Member] | Arvest Bank [Member] | Merger With Arvest [Member]          
Business Acquisition, Share Price         $ 10.28
Performance Shares [Member]          
Allocated Share-based Compensation Expense $ 152,000 $ 25,000      
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 Arrangement by Share-based Payment Award, Expiration Period 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        
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, Intrinsic Value $ 387,000     $ 387,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 0     0  
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 Two [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] | 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] | Employee Stock Option [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 292 days        
Allocated Share-based Compensation Expense $ 33,000 108,000 $ 148,000    
Two Thousand Eleven Omnibus Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 73 days        
Allocated Share-based Compensation Expense $ 926,000 $ 1,100,000 $ 642,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 800,000     $ 800,000  
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%