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Note 2 - Cash, Cash Equivalent, and Investments - Majority Security Type (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalent, fair value $ 20,637,045 $ 4,823,544
Cash, adjusted cost 149,015 1,010,510
Money Market Funds, adjusted cost 20,488,030 3,813,034
Cash and cash equivalents, adjusted cost 20,637,045 4,823,544
Gross Unrealized Holding Gains 22,473 22,452
Gross Unrealized Holding Losses (6,463) (17,991)
Short-term investment securities 8,457,452 29,399,146
Total, fair value 29,110,506 35,738,787
Total, adjusted 29,094,496 35,734,326
Long-term investment securities 0 1,511,636
Corporate Bond Securities [Member]    
Short-term investment securities [1],[2] 8,457,451 29,399,146
Long-term investment securities [2],[3]   1,511,636
Fair Value, Inputs, Level 2 [Member] | Short-term Corporate Bonds [Member]    
Gross Unrealized Holding Gains [1],[2] 22,473 5,898
Fair Value, Inputs, Level 2 [Member] | Long- term Corporate Bonds [Member]    
Gross Unrealized Holding Gains [2],[3]   16,554
Cash [Member]    
Cash and cash equivalent, fair value 149,015 1,010,510
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalent, fair value 20,488,030 3,813,034
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Corporate Bonds, fair value [1],[2] 8,473,461 29,387,053
Gross Unrealized Holding Losses [1],[2] $ (6,463) (17,991)
Long- term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Corporate Bonds, fair value [2],[3]   1,528,190
Gross Unrealized Holding Losses [2],[3]   $ 0
[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 $282,946 and $233,550 for the years ended December 31, 2020 and 2019, respectively.
[3] Long-term investment securities will mature longer than 12 months from the applicable reporting date.