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Statements of Comprehensive Income (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Other Comprehensive Income [Abstract]    
Net income $ 452,448 $ 479,082
Other comprehensive (loss):    
Interest rate swaps, before taxes (101,678) (6,498)
Income tax applicable to interest rate swaps 36,604 2,592
Other comprehensive (loss), net of taxes (65,074) (3,906)
Total comprehensive income $ 387,374 $ 475,176