Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Schedule of Lines of Credit) (Details)

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Long-Term Debt (Schedule of Lines of Credit) (Details) - USD ($)
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]        
Lines of Credit $ 3,348,000   $ 3,160,000  
Metropolitan Life Insurance Company and New England Life Insurance Company revolving line of credit [Member]        
Line of Credit Facility [Line Items]        
Lines of Credit        
Amount of credit facility $ 25,000,000      
Interest rate at end of period 1.78%      
Working Capital Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Lines of Credit        
Amount of credit facility $ 70,000,000      
Interest rate at end of period 1.93%      
Remaining available credit $ 52,500,000      
Prudential Mortgage Capital Company, LLC revolving line of credit [Member]        
Line of Credit Facility [Line Items]        
Lines of Credit 3,348,000 $ 3,348,000 $ 3,160,000 $ 3,160,000
Amount of credit facility $ 6,000,000 $ 6,000,000    
Interest rate at end of period   3.01%   2.98%
Remaining available credit   $ 2,600,000   $ 2,800,000