Earnings per share (Details Textual)	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Weighted average diluted common shares outstanding (in shares)	8,124,386	8,124,386

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

No definition available.

Name:	us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration