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Note 11. Stock Options (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         2,640,231 2,515,231
Independent directors            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     36,000      
Noninterest Expense Directors Fees $ 14,300 $ 21,500 $ 30,100 $ 67,300    
The 2004 Stock Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,588,000   1,588,000      
The 2010 Stock Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,079,000   1,079,000