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Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Cash and cash equivalent, fair value $ 9,476,412 $ 15,748,480
Cash, adjusted cost 1,521,964 1,377,094
Money Market Funds, adjusted cost 7,954,448 14,371,386
Cash and cash equivalents, adjusted cost 9,476,412 15,748,480
Corporate Bonds, gross unrealized holding losses (52,002) (2,495)
Short-term investment securities 6,163,833 4,511,780
Total, fair value 15,588,243 20,257,765
Total, adjusted 15,640,245 20,260,260
Total, fair value 15,588,243 20,257,765
Short-term Corporate Bonds [Member]    
Short-term investment securities [1],[2] 6,163,833  
Corporate Bond Securities [Member]    
Short-term investment securities [3]   4,511,780
Cash [Member]    
Cash and cash equivalent, fair value 1,521,964 1,377,094
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalent, fair value 7,954,448 14,371,386 [4]
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Corporate Bonds, fair value 6,111,831 [1],[2] 4,509,285 [3]
Corporate Bonds, gross unrealized holding losses $ (52,002) [1],[2] $ (2,495) [3]
[1] Short-term investment securities will mature within 12 months or less, from the applicable reporting date.
[2] The premiums paid to purchase held-to-maturity investment securities was $20,850 and $283,940 for the three months ended March 31, 2022, and 2021 , respectively. The premiums paid to purchase held-to-maturity investment securities was $283,940 for the year ended December 31, 2021.
[3] The premiums paid to purchase held-to-maturity investment securities was $20,850 and $283,940 for the three months ended March 31, 2022, and 2021, respectively. The premiums paid to purchase held-to-maturity investment securities was $283,940 for the year ended December 31, 2021.
[4] Long-term investment securities will mature longer than 12 months from the applicable reporting date.