Consolidated Balance Sheets (unaudited) - USD ($)	Dec. 31, 2016	Jun. 30, 2016
Current assets:
Cash and cash equivalents	$ 12,766,120	$ 9,049,327
Accounts receivable, less allowance for doubtful accounts of $96,868 and $98,868, respectively	3,770,168	3,869,427
Inventories, net	4,986,521	5,822,935
Prepaid expenses and other current assets	302,224	530,564
Total current assets	21,825,033	19,272,253
Property, plant and equipment, net of accumulated amortization and depreciation of $7,361,655 and $6,976,282, respectively	3,184,334	2,492,815
Patents, net of accumulated amortization of $938,119 and $885,394, respectively	707,366	604,916
Goodwill	1,701,094	1,701,094
Intangible and other assets	305,421	266,603
Deferred income tax	3,454,690	3,394,690
Total assets	31,177,938	27,732,371
Current liabilities:
Accounts payable	1,400,545	1,402,797
Accrued expenses and other current liabilities	2,270,983	1,887,337
Total current liabilities	3,671,528	3,290,134
Deferred lease liability	9,308	9,262
Deferred income	7,765	31,685
Total liabilities	3,688,601	3,331,081
Shareholders' equity:
Common stock, $.01 par value-shares authorized 20,000,000; 9,132,203 and 7,948,234 shares issued and 8,993,354 and 7,809,385 outstanding in each period, respectively	91,322	79,482
Additional paid-in capital	36,715,393	32,502,521
Accumulated deficit	(8,218,026)	(7,081,361)
Treasury stock, at cost, 138,849 shares in each period	(1,099,352)	(1,099,352)
Total shareholders' equity	27,489,337	24,401,290
Total liabilities and shareholders' equity	$ 31,177,938	$ 27,732,371