Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Dec. 31, 2017	Jun. 30, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 96,868	$ 96,868
Accumulated amortization and depreciation	8,437,445	7,794,580
Patents, net of accumulated amortization	$ 1,057,851	$ 995,568
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized	20,000,000	20,000,000
Common stock, issued	9,400,666	9,357,166
Common stock, outstanding	9,400,666	9,357,166