Consolidated Balance Sheets (unaudited) - USD ($)	Mar. 31, 2017	Jun. 30, 2016
Current assets:
Cash and cash equivalents	$ 11,856,503	$ 9,049,327
Accounts receivable, less allowance for doubtful accounts of $96,868 and $96,868, respectively	4,357,156	3,869,427
Inventories, net	4,909,415	5,822,935
Prepaid expenses and other current assets	664,249	530,564
Total current assets	21,787,323	19,272,253
Property, plant and equipment, net of accumulated amortization and depreciation of $7,610,152 and $6,976,282, respectively	3,413,116	2,492,815
Patents, net of accumulated amortization of $965,996 and $885,394, respectively	710,070	604,916
Goodwill	1,701,094	1,701,094
Intangible and other assets	300,341	266,603
Deferred income tax	3,581,551	3,394,690
Total assets	31,493,495	27,732,371
Current liabilities:
Accounts payable	1,433,608	1,402,797
Accrued expenses and other current liabilities	1,994,387	1,887,337
Total current liabilities	3,427,995	3,290,134
Deferred lease liability	9,331	9,262
Deferred income	17,737	31,685
Total liabilities	3,455,063	3,331,081
Commitments and contingencies (Footnote 9)
Shareholders' equity:
Common stock, .01 par value-shares authorized 20,000,000; 9,162,203 and 7,948,234 shares issued and 9,023,354 and 7,809,385 outstanding in each period, respectively	91,622	79,482
Additional paid-in capital	37,410,034	32,502,521
Accumulated deficit	(8,363,872)	(7,081,361)
Treasury stock, at cost, 138,849 shares in each period	(1,099,352)	(1,099,352)
Total shareholders' equity	28,038,432	24,401,290
Total liabilities and shareholders' equity	$ 31,493,495	$ 27,732,371