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Statements of Comprehensive Income (Loss) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 144,555 $ (221,123)
Other comprehensive (loss) income:    
Interest rate swaps, before taxes (36,092) 58,625
Income tax applicable to interest rate swaps 9,023 (14,766)
Other comprehensive (loss) income, net of taxes (27,069) 43,859
Total comprehensive income (loss) $ 117,486 $ (177,264)