Quarterly report pursuant to Section 13 or 15(d)

Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals)

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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2022
Dec. 31, 2021
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 10,000,000 10,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 100,000,000 100,000,000
Common stock, issued (in shares) 36,864,957 36,809,187
Common stock, outstanding (in shares) 36,864,957 36,809,187