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Shares Issued through Equity Offering Program (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Shares Issued through Equity Offering Program    
Number of shares sold (in shares) 143,120 180,120
Proceeds from sale of common stock, net of commissions $ 4,308,000 $ 5,392,000
Payment of commissions on sale of shares 44,000 54,000
Payment of offering costs on sale of shares $ 33,000 $ 78,000