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Note 4 - Stockholders' Equity - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Outstanding (in shares) 1,127 1,127
Outstanding at January 1, 2019 (in dollars per share) $ 22.20 $ 22.20
Granted (in shares)   15,689
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 5.95 $ 5.95
Vested (in shares)   (8,835)
Vested, Weighted Average Grant Date Fair Value (in dollars per share)   $ 8.03
Outstanding (in shares)   7,981
Outstanding at December 31, 2019 (in dollars per share)   $ 5.95