6. Earnings (Loss) per common share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 45,300	$ 94,400	$ (3,400)	$ 34,300
Weighted average common shares outstanding	1,489,112	1,489,112	1,489,112	1,489,112
Dilutive securities	0	0	0	0
Weighted average dilutive common shares outstanding	1,489,112	1,489,112	1,489,112	1,489,112
Basic and diluted earnings (loss) per common share	$ .03	$ .06	$ .00	$ .02