Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parentheticals)

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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Series A preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Series A preferred stock, shares authorized (in shares) 50,000 50,000
Series A preferred stock, shares issued (in shares) 0 0
Series A preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 13,898,694 13,757,200
Common stock, shares outstanding (in shares) 13,882,932 13,742,530
Treasury stock, shares (in shares) 15,762 14,670