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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.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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