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6. Earnings (Loss) Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]        
Net income (loss) attributable to parent company $ (140,722) $ 73,478 $ (1,309,024) $ 861,357
Weighted-average shares of common stock outstanding:        
Basic shares outstanding 10,570,203 10,519,394 10,570,203 10,495,573
Dilutive effect of common stock equivalents arising from stock options 0 265,885 0 265,885
Diluted shares outstanding 10,570,203 10,785,279 10,570,203 10,761,458
Basic earnings (loss) per share $ (0.01) $ 0.01 $ (0.12) $ 0.08
Diluted earnings (loss) per share $ (0.01) $ 0.01 $ (0.12) $ 0.08