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Statements of Comprehensive Income - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Statement of Other Comprehensive Income [Abstract]    
Net income $ 508,448 $ 1,213,239
Other comprehensive income (loss):    
Interest rate swaps, before taxes 41,179 (39,708)
Income tax applicable to interest rate swaps (14,825) 12,783
Other comprehensive income (loss), net of taxes 26,354 (26,925)
Total comprehensive income $ 534,802 $ 1,186,314