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Note O - Employee and Director Benefit Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 75.00%      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 6.00%      
Defined Contribution Plan, Employer Contributions $ 260,000 $ 260,000 $ 260,000  
Employee Stock Ownership Plan (ESOP), Compensation Expense   $ 7,285,390 $ 7,106,959  
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 237,923 247,627 270,455  
Cash Surrender Value of Life Insurance $ 19,381,000 $ 18,841,000    
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.20% 4.30%    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed 6.25%      
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50%      
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2026      
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation, Percent 16.78%      
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components, Percent 17.46%      
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation, Percent 13.51%      
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components, Percent 13.98%      
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax $ (81,000)      
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax (475,000)      
Other Postretirement Benefits Plan [Member] | Forecast [Member]        
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax       $ 81,381
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax       $ 74,600
Postretirement Life Insurance [Member]        
Cash Surrender Value of Life Insurance $ 311,088 $ 306,146    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00%      
Defined Benefit Plan, Accumulated Benefit Obligation $ 101,613 97,587    
Certain Key Executives [Member] | Other Postretirement Benefits Plan [Member]        
Cash Surrender Value of Life Insurance $ 1,850,592 1,729,904    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00%      
Defined Benefit Plan, Accumulated Benefit Obligation $ 1,622,840 1,613,326    
Director [Member] | Other Postretirement Benefits Plan [Member]        
Cash Surrender Value of Life Insurance $ 194,270 184,070    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00%      
Defined Benefit Plan, Accumulated Benefit Obligation $ 229,392 213,661    
Executive Supplemental Income Plan [Member]        
Defined Benefit Plan, Payment Period 15 years      
Executive Supplemental Income Plan [Member] | President and CEO [Member]        
Defined Benefit Plan, Percentage of Compensation 67.00%      
Executive Supplemental Income Plan [Member] | Executive Vice President [Member]        
Defined Benefit Plan, Percentage of Compensation 58.00%      
Executive Supplemental Income Plan [Member] | Executive Officer [Member]        
Defined Benefit Plan, Percentage of Compensation 50.00%      
Directors' Deferred Income Plan [Member]        
Defined Benefit Plan, Payment Period 10 years      
Interest on Deferred Fees, Percent 10.00%      
Cash Surrender Value of Life Insurance $ 17,024,779 16,620,943    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00%      
Defined Benefit Plan, Accumulated Benefit Obligation $ 13,229,501 $ 12,919,127