Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parentheticals)

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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Preferred stock and certificates of proprietary interest, par value (in dollars per share) $ 0.01 $ 100
Preferred stock authorized (in shares) 1,000,000  
Preferred stock and certificates of proprietary interest, outstanding (in shares) 0 0
Common stock and sub-share certificates of proprietary interest, par value (in dollars per share) $ 0.01  
Common stock authorized (in shares) 7,756,156  
Common stock and sub-share certificates of proprietary interest, outstanding (in shares) 7,744,695  
Treasury stock (in shares) 11,461 0
Sub-share Certificates in Certificates of Proprietary Interest    
Common stock and sub-share certificates of proprietary interest, par value (in dollars per share)   $ 0.0333
Common stock and sub-share certificates of proprietary interest, outstanding (in shares)   7,756,156
1/16th nonparticipating perpetual royalty interest    
Nonparticipating perpetual royalty interest rate (in percentage) 6.25% 6.25%
1/128th nonparticipating perpetual royalty interest    
Nonparticipating perpetual royalty interest rate (in percentage) 0.78125% 0.78125%