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Note 5. Long-Term Debt - Related Party (Tables)
 6 Months Ended
Sep. 30, 2012
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Month
 
Amount of
Advance
   
Number of
Warrant Shares
Vested
   
Fair Value of
Warrant Shares
on Date Vested
     
Exercise
Price
   
Risk-Free
Interest
Rate
   
Expected
Life
(In Years)
   
Expected
Volatility
 
March 2012
  $ 2,000       --     $ -         --       --       --       --  
December 2011
    2,000       --       -         --       --       --       --  
September 2011
    1,000       1,229,105       1,611    (1)   $ 2.034       0.96 %     5.00       86 %
December 2010
    500       37,879       30       $ 1.650       1.56 %     3.90       91 %
June 2010
    2,000       151,515       87       $ 1.650       1.58 %     4.37       93 %
March 2010
    2,500       189,394       106       $ 1.650       2.36 %     4.62       91 %
November 2009
    -       272,727       221       $ 1.375       2.31 %     5.00       89 %
Total
  $ 10,000       1,880,620     $ 2,055                                    
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Three Months Ended
September 30,
   
Six Months Ended
September 30,
 
   
2012
   
2011
   
2012
   
2011
 
Debt cost expense (1)
  $ 128     $ 43     $ 272     $ 84  
Interest expense
    233       96       422       191