Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)

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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Allowance for accounts with joint ventures $ 0.0 $ 0.0
Allowance for value added tax and other receivables $ 6,400 $ 5,700
Preferred stock, par value (in dollars per share) $ 25 $ 25
Preferred stock, shares authorized (in shares) 500,000 500,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 70,125,626 69,562,774
Common stock, shares outstanding (in shares) 59,068,105 58,623,451
Treasury stock, shares (in shares) 11,057,521 10,939,323