Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)

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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts $ 10,000 $ 5,000
Furniture, fixtures & equipment, accumulated depreciation 707,167 659,144
Patents, accumulated amortization $ 809,332 $ 717,086
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 7,000 7,000
Preferred stock, shares outstanding (in shares) 7,000 7,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 31,376,699 30,457,224
Common stock, shares to be issued (in shares) 1,361,071 1,270,481
Common stock, shares outstanding (in shares) 31,343,366 30,423,891
Treasury stock, at cost, shares (in shares) 33,333 33,333