Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2016	Jun. 30, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts (in dollars)	$ 96,868	$ 98,868
Accumulated amortization and depreciation (in dollars)	7,136,072	6,976,282
Patents, Accumulated amortization (in dollars)	$ 911,637	$ 885,394
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	7,948,234	7,948,234
Common stock, shares outstanding	7,809,385	7,809,385
Treasury stock, shares	138,849	138,849