Quarterly Financial Data (Unaudited): (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data (Unaudited):

Schedule of the Company's quarterly financial data

	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Total
2016
Total Revenue	$	16,180,300	$	16,299,800	$	16,734,300	$	17,365,900	$	66,580,300
Income from Operations		8,038,600		9,323,100		10,438,000		10,501,300		38,301,000
Net Income		4,562,900		5,394,300		6,094,200		6,166,200		22,217,600
Net Income Per Common Share - Basic	$	1.11	$	1.31	$	1.48	$	1.49	$	5.39
Net Income Per Common Share - Diluted	$	1.06	$	1.25	$	1.41	$	1.41	$	5.13
2015
Total Revenue	$	21,024,100	$	15,476,700	$	15,999,500	$	6,947,500	$	69,447,800
Income from Operations		9,974,100		8,084,200		9,341,800		9,690,600		37,090,700
Net Income		6,054,300		4,751,400		5,339,600		5,654,400		21,799,700
Net Income Per Common Share - Basic	$	1.21	$	1.04	$	1.29	$	1.37	$	4.89
Net Income Per Common Share - Diluted	$	1.17	$	1.00	$	1.23	$	1.31	$	4.69