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Note 9 - Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] |
|  | Total Carrying Amount in Consolidated Balance Sheet March 31, 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 |  | $ | 71,608,120 |  |  | $ | 71,608,120 |  |  | $ | 884,303 |  |  | $ | 1,770,783 |

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