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Note 2 - Cash, Cash Equivalent, and Investments - Major Security Type (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and cash equivalent, fair value |  | $ 15,748,480 | $ 20,637,045
Cash, adjusted cost |  | 1,377,094 | 149,015
Money Market Funds, adjusted cost |  | 14,371,386 | 20,488,030
Cash and cash equivalents, adjusted cost |  | 15,748,480 | 20,637,045
Gross Unrealized Holding Gains |  | 0 | 22,473
Gross Unrealized Holding Losses |  | (2,495) | (6,463)
Short-term investment securities |  | 4,511,780 | 8,457,452
Total, fair value |  | 20,257,765 | 29,110,506
Total, adjusted |  | 20,260,260 | 29,094,496
Corporate Bond Securities [Member] |  |  |
Short-term investment securities | [1],[2] | 4,511,780 | 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 |  | 1,377,094 | 149,015
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalent, fair value |  | 14,371,386 | 20,488,030
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Corporate Bonds, fair value | [1],[2] | 4,509,285 | 8,473,461
Gross Unrealized Holding Losses | [1],[2] | $ (2,495) | $ (6,463)
[1] | For the three months ended September 30, 2021 and 2020, there was no premium paid to purchase held-to-maturity investment securities. The premium paid to purchase held-to-maturity investment securities was $283,940 and $221,156 for the nine months ended September 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.
[2] | Short-term investment securities will mature within 12 months or less, from the applicable reporting date.

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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: 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 4: 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 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: 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 + Details
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