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Net Income per Common Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Anti-dilutive outstanding options 0 16,328 58,302 45,479  
Preferred stock, shares outstanding 8,634   8,634   8,340
Series F Preferred Stock [Member]          
Preferred stock, shares outstanding 6,465   6,465    
Preferred stock, dividend rate 6.00% 6.00% 6.00% 6.00% 6.00%