Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock authorized (in shares) 1,000,000 1,000,000
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock authorized (in shares) 7,756,156 7,756,156
Common stock, outstanding (in shares) 7,745,290 7,744,695
Treasury stock (in shares) 10,866 11,461
1/16th nonparticipating perpetual royalty interests    
Nonparticipating perpetual royalty interest rate (in percentage) 6.25%  
1/128th nonparticipating perpetual royalty interests    
Nonparticipating perpetual royalty interest rate (in percentage) 0.78125%