| Note 4. Stock-based Compensation (Details 3) (Restricted Stock Awards) | 9 Months Ended | 
|---|---|
| Jun. 30, 2013 | |
| Restricted Stock Awards | |
| Outstanding, beginning of period | 263 | 
| Granted | 0 | 
| Forfeited | 0 | 
| Vested | 0 | 
| Outstanding, end of period | 263 | 
| X | ||||||||||
| 
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 |