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Shareholders' Equity and Dividends (Details 1) - USD ($)
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Class Of Stock [Line Items]              
Dividends amount per share, declared $ 0.03 $ 0.025 $ 0.135   $ 0.15 $ 0.175 $ 0.20
Dividends amount per share $ 0.03 $ 0.025 $ 0.135   $ 0.15 $ 0.175 $ 0.20
Total Cash Dividend $ 1,381,000 $ 1,150,000 $ 6,205,000   $ 6,893,000 $ 8,025,000 $ 9,171,000
Dividend Declared [Member]              
Class Of Stock [Line Items]              
Total Cash Dividend $ 2,996,122            
Payment Date Dec. 08, 2020            
Stockholders Record Date Nov. 24, 2020            
Dividend Declared [Member] | Class A common stock [Member]              
Class Of Stock [Line Items]              
Dividends amount per share, declared $ 0.0650            
Dividend Paid [Member]              
Class Of Stock [Line Items]              
Total Cash Dividend   $ 1,382,825 $ 1,149,695 $ 6,205,102 $ 6,203,347    
Payment Date   Sep. 08, 2020 Jun. 08, 2020 Mar. 09, 2020 Dec. 03, 2019    
Stockholders Record Date   Aug. 25, 2020 May 25, 2020 Feb. 25, 2020 Nov. 20, 2019    
Dividend Paid [Member] | Class A common stock [Member]              
Class Of Stock [Line Items]              
Dividends amount per share   $ 0.0300 $ 0.0250 $ 0.1350 $ 0.1350