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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares | Jun. 30, 2021 | Dec. 31, 2020
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Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 5,000,000 | 5,000,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 200,000,000 | 200,000,000
Common stock, shares outstanding (in shares) | 112,223,991 | 111,830,857

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