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Consolidated Balance Sheets (Parentheticals) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, liquidation value 0.001 0.001
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares designated 825,000 825,000
Preferred stock, shares issued 10,000 10,000
Preferred stock, shares outstanding 10,000 10,000
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 10,638,771 10,528,689
Common stock, shares, outstanding 10,638,771 10,528,689
Treasury stock (shares) 11,080 11,080