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Note 9 - Fair Value (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
  

Total Carrying Amount in Consolidated Balance Sheet June 30, 2022

  

Quoted Prices in Active Markets for Identical Assets

  

Realized Gains and (Losses)

  

Total Changes in Fair Values Included in Current Period Earnings (Loss)

 
                 

Marketable equity securities and U.S. Treasury trading securities

 $61,867,658  $61,867,658  $(1,108,834) $(12,437,428)