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EARNINGS (LOSS) PER SHARE (Parentheticals) (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
6% Prior Cumulative Preferred, $5 par value        
Class of Stock [Line Items]        
Stated percentage of preferred stock 6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
Preferred stock, par value (in dollars per share) $ 5us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
$ 5us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
$ 5us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
$ 5us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_SixPercentPriorCumulativePreferredStockMember
5% Convertible Cumulative Preferred, $20 par value        
Class of Stock [Line Items]        
Stated percentage of preferred stock 5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
Preferred stock, par value (in dollars per share) $ 20us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
$ 20us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
$ 20us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember
$ 20us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= csgn_FivePercentConvertibleCumulativePreferredStockMember