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Note 2 - Cash, Cash Equivalent, and Investments - Major Security Type (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Cash and cash equivalent, fair value $ 13,055,558 $ 20,637,045
Cash, adjusted cost 1,217,419 149,015
Money Market Funds, adjusted cost 11,838,139 20,488,030
Cash and cash equivalents, adjusted cost 13,055,558 20,637,045
Gross Unrealized Holding Gains 1,658 22,473
Gross Unrealized Holding Losses (17,847) (6,463)
Short-term investment securities 14,177,441 8,457,452
Total, fair value 27,216,810 29,110,506
Total, adjusted 27,232,999 29,094,496
Corporate Bond Securities [Member]    
Short-term investment securities [1],[2] 14,177,441 8,457,451
Fair Value, Inputs, Level 2 [Member] | Short-term Corporate Bonds [Member]    
Gross Unrealized Holding Gains [1],[2] 1,658 22,473
Cash [Member]    
Cash and cash equivalent, fair value 1,217,419 149,015
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalent, fair value 11,838,139 20,488,030
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Corporate Bonds, fair value [1],[2] 14,161,252 8,473,461
Gross Unrealized Holding Losses [1],[2] $ (17,847) $ (6,463)
[1] Short-term investment securities will mature within 12 months or less, from the applicable reporting date.
[2] The premium paid to purchase held-to-maturity investment securities was $283,940 and $196,385 for the three months ended March 31, 2021 and 2020, respectively. The premium paid to purchase held-to-maturity investment securities was $282,946 for the year ended December 31, 2020.