Earning per share (Details) - shares  | 
Sep. 30, 2016  | 
Sep. 30, 2015  | 
|---|---|---|
| Earning per share Details | ||
| Computation of dilutive weighted average number of shares outstanding | 11,758,623 | 13,635,000 | 
| Potentially dilutive shares outstanding | 4,500 | 4,500 | 
| X | ||||||||||
- Definition Computation of dilutive weighted average number of shares outstanding No definition available. 
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| X | ||||||||||
- References No definition available. 
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| X | ||||||||||
- Definition Potentially dilutive shares outstanding No definition available. 
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