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Common Stock (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Common Stock Activity The following table provides activity in the Equity Shelf Program for the three and twelve months ended March 31, 2019:
 
Three Months Ended
 
Twelve Months Ended
 
March 31,
 
March 31,
 
2019
 
2018
 
2019
 
2018
Gross proceeds
$
23,073,149

 
$
9,199,661

 
$
99,023,464

 
$
50,976,456

Less: agent commissions
(230,731
)
 
(91,997
)
 
(990,234
)
 
(509,765
)
Net proceeds
$
22,842,418

 
$
9,107,664

 
$
98,033,230

 
$
50,466,691

 
 
 
 
 
 
 
 
Number of shares sold
277,829

 
137,300

 
1,286,234

 
643,007

Weighted average price per share
$
83.05

 
$
67.00

 
$
76.99

 
$
79.28