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Note 6. Accounting for Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
For Three Months Ended
June 30, 2016
 
 
For Three Months Ended
June 30, 2015
 
 
For Six
Months Ended
June 30, 2016
 
 
For Six
Months Ended
June 30, 2015
 
                                 
Weighted average grant date fair value
   $ 0.29     $ 1.93     $ 0.29     $ 2.11  
Weighted average assumptions used:
                                
Expected dividend yield
     0.0
%
     0.0
%
     0.0
%
     0.0
%
Risk-free interest rate
     1.38
%
     1.33
%
     1.38
%
     1.38
%
Expected volatility
     96.0
%
     170.0
%
     96.0
%
     176.3
%
Expected life (in years)
     5.0       5.0       5.0       5.0