Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 249,233 $ 89,368 $ 573,901 $ 543,969
Comprehensive income $ 249,233 $ 89,368 $ 573,901 $ 543,969