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Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                    
Net sales $ 7,827,194 $ 5,663,161 $ 11,531,105 $ 7,496,423 $ 5,460,600 $ 5,324,104 $ 5,667,624 $ 6,068,684 $ 32,517,883 $ 22,521,012
Gross profit 1,870,296 1,255,204 3,075,598 1,461,154 1,162,170 1,128,505 1,080,145 1,343,748 7,662,252 4,714,568
Net income $ 700,398 $ 317,764 $ 1,614,871 $ 442,764 $ 191,659 $ 279,173 $ 244,079 $ 420,825 $ 3,075,797 $ 1,135,736
Net income per share:                    
Basic $ 0.30 $ 0.14 $ 0.69 $ 0.19 $ 0.08 $ 0.12 $ 0.11 $ 0.18 $ 1.32 $ 0.49
Diluted $ 0.29 $ 0.14 $ 0.69 $ 0.19 $ 0.08 $ 0.12 $ 0.11 $ 0.18 $ 1.31 $ 0.49