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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Mar. 31, 2016
Feb. 28, 2015
Sep. 30, 2016
Sep. 30, 2015
2007 Director Non-Qualified Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 417,326 $ 445,650
Restricted Stock Plan [Member] | Executive Officers, Non-employee Directors and Other Key Employees [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     300,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   4 years    
Restricted Stock Plan [Member] | Chief Executive Officer [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 11,765 9,343    
Restricted Stock Plan [Member] | Chief Financial Officer [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   9,343    
Restricted Stock Plan [Member] | Senior Vice President [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   9,343    
Restricted Stock Plan [Member] | Independent Director 4 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,031 1,613    
Restricted Stock Plan [Member] | Independent Director 1 Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,031 1,613    
Restricted Stock Plan [Member] | Independent Director 2 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,031 1,613    
Restricted Stock Plan [Member] | Independent Director 3 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,031 1,613    
Restricted Stock Plan [Member] | President [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 11,765      
Restricted Stock Plan [Member] | Independent Directors 5 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,031      
Restricted Stock Plan [Member] | Interim Chief Executive Officer, Interim President and 5 Directors [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 4 years      
Restricted Stock Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years  
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0
Allocated Share-based Compensation Expense     $ 0 $ 0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     33,685 34,484