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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2022
Dec. 31, 2021
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
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) 150,000,000 150,000,000
Common stock, shares issued (in shares) 125,840,811 125,594,393
Common stock, shares outstanding (in shares) 125,840,811 125,594,393