6. Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to parent company	$ 253,938	$ 178,734
Weighted-average shares of common stock outstanding:
Basic shares outstanding	10,570,203	10,570,203
Dilutive effect of common stock equivalents arising from stock options	135,297	111,963
Diluted shares outstanding	10,705,500	10,682,166
Basic earnings per share	$ 0.02	$ 0.02
Diluted earnings per share	$ 0.02	$ 0.02