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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 27,413,098 27,413,098
Preferred stock, shares outstanding (in shares) 27,413,098 27,413,098
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 1,697,443 1,325,529
Common stock, shares outstanding (in shares) 1,697,443 1,325,529
Common stock, unvested or restricted share awards (in shares) 366,293 286,566