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Shareholder's Equity and Dividends (Details 1) - USD ($)
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
[1]
Class Of Stock [Line Items]          
Dividends amount per share $ 0.15 $ 0.175 $ 0.20    
Total Cash Dividend $ 6,893,000 $ 8,025,000 $ 9,171,000    
Dividend Declared [Member]          
Class Of Stock [Line Items]          
Total Cash Dividend $ 6,203,347        
Payment Date Dec. 03, 2019        
Stockholders Record Date Nov. 20, 2019        
Dividend Declared [Member] | Class A common stock [Member]          
Class Of Stock [Line Items]          
Dividends amount per share, declared $ 0.1350        
Dividend Paid [Member]          
Class Of Stock [Line Items]          
Total Cash Dividend   $ 6,879,245 $ 8,025,786 $ 9,171,000 $ 4,356,225
Payment Date   Sep. 06, 2019 May 29, 2019 Feb. 28, 2019 Nov. 15, 2018
Stockholders Record Date   Aug. 26, 2019 May 17, 2019 Feb. 21, 2019 Nov. 08, 2018
Dividend Paid [Member] | Class A common stock [Member]          
Class Of Stock [Line Items]          
Dividends amount per share   $ 0.1500 $ 0.1750 $ 0.2000 $ 0.0950
[1] Initial pro rata dividend, prorated for the period from August 23, 2018 to September 30, 2018.