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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accounts receivable, allowance for doubtful accounts $ 1,550 $ 1,751
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstandng (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0005 $ 0.0005
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 78,574,482 76,525,581
Common stock, shares outstanding (in shares) 76,783,296 75,292,383
Treasury stock, shares (in shares) 1,791,186 1,233,198