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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Preferred stock, par value (in dollars per share) $ 0.000001 $ 0.000001
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 10,257,078 7,612,838
Common stock, shares outstanding (in shares) 10,257,078 6,612,838
Treasury stock, par value (in dollars per share)   $ 0.10
Treasury stock, shares (in shares)   1,000,000
Series B Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.000001 $ 0.000001
Preferred stock, shares authorized (in shares) 18,000,000 18,000,000
Preferred stock, shares issued (in shares) 872,766 0
Preferred stock, shares outstanding (in shares) 872,766 0