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Note 13 - Employee Benefit Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Feb. 29, 2016
Jun. 30, 2015
Feb. 28, 2015
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 27, 2015
May 26, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term         10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         20.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         112,500        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         1 year 127 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 660,120 $ 565,025      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         660,120 565,025      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         0 143,350 $ 361,517    
Allocated Share-based Compensation Expense         393,638 297,295 254,340    
Director [Member]                  
Restricted Stock or Unit Expense         126,032 124,910 122,538    
Officer [Member]                  
Restricted Stock or Unit Expense         $ 267,606 $ 176,644 $ 102,099    
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         24,679 28,951 34,562    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 287,443        
Restricted Stock [Member] | Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 9,336 966 8,281 11,242          
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options Cliff Vesting Period 1 year 3 years              
Restricted Stock [Member] | Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         15,343 19,704 23,320    
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options Cliff Vesting Period         3 years 3 years 3 years    
2015 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               250,000  
2015 Equity Plan [Member] | Restricted Stock [Member]                  
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Aggregate Grants         27,645        
2010 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 200,000
2010 Equity Plan [Member] | Restricted Stock [Member]                  
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Aggregate Grants         139,330        
2010 Equity Plan [Member] | Employee Stock Option [Member]                  
Share Based Compensation Arrangement by Share Based Payment Award Options Aggregate Grants         25,000