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 ($)
Mar. 31, 2019
Dec. 31, 2018
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
Preferred stock, liquidation preference $ 7,000,000 $ 7,000,000
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) 40,855,721 33,859,034
Common stock, shares to be issued (in shares) 2,807,710 2,470,565
Common stock, shares outstanding (in shares) 40,822,388 33,825,701
Treasury stock, at cost, shares (in shares) 33,333 33,333