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Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Cash and cash equivalent, fair value $ 14,018,826 $ 20,637,045
Cash, adjusted cost 820,985 149,015
Money Market Funds, adjusted cost 13,197,841 20,488,030
Cash and cash equivalents, adjusted cost 14,018,826 20,637,045
Gross Unrealized Holding Gains 0 22,473
Gross Unrealized Holding Losses (11,577) (6,463)
Short-term investment securities 11,581,911 8,457,452
Total, fair value 25,589,160 29,110,506
Total, adjusted 25,600,737 29,094,496
Corporate Bond Securities [Member]    
Short-term investment securities [1],[2] 11,581,911 8,457,451
Fair Value, Inputs, Level 2 [Member] | Short-term Corporate Bonds [Member]    
Gross Unrealized Holding Gains [1],[2] 0 22,473
Cash [Member]    
Cash and cash equivalent, fair value 820,985 149,015
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalent, fair value 13,197,841 20,488,030
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Corporate Bonds, fair value [1],[2] 11,570,334 8,473,461
Gross Unrealized Holding Losses [1],[2] $ (11,577) $ (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 $0 and $24,771 for the three months ended June 30, 2021 and 2020, respectively. The premium paid to purchase held-to-maturity investment securities was $283,940 and $221,156 for the six months ended June 30, 2021, and 2020, respectively. The premium paid to purchase held-to-maturity investment securities was $282,946 for the year ended December 31, 2020.