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Shares Issued through Equity Offering Program (Details) - USD ($)
 3 Months Ended
Apr. 04, 2016
Mar. 20, 2014
Mar. 31, 2016
Mar. 31, 2015
Shares Issued through Equity Offering Program        
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement   $ 38,360,000    
Number of shares sold (in shares) 53,563   62,499 0
Proceeds from sale of shares, net of commission and before offering costs $ 1,190,000   $ 1,387,000  
Payment of commissions on sale of shares $ 12,000   14,000  
Payment of offering costs on sale of shares.     $ 40,000