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Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cash and cash equivalent, fair value |  | $ 5,794,272 |  | $ 15,748,480 |
Cash, adjusted cost |  | 26,782 |  | 1,377,094 |
Money Market Funds, adjusted cost |  | 5,767,490 |  | 14,371,386 |
Cash and cash equivalents, adjusted cost |  | 5,794,272 |  | 15,748,480 |
Corporate Bonds, gross unrealized holding losses |  | (47,208) |  | (2,495) |
Short-term investment securities |  | 6,847,270 |  | 4,511,780 |
Total, fair value |  | 12,594,334 |  | 20,257,765 |
Total, adjusted |  | 12,641,542 |  | 20,260,260 |
Total, fair value |  | 12,594,334 |  | 20,257,765 |
Short-term Corporate Bonds [Member] |  |  |  |  |
Short-term investment securities | [1],[2] | 6,847,270 |  |  |
Corporate Bond Securities [Member] |  |  |  |  |
Short-term investment securities | [3] |  |  | 4,511,780 |
Cash [Member] |  |  |  |  |
Cash and cash equivalent, fair value |  | 26,782 |  | 1,377,094 |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Cash and cash equivalent, fair value |  | 5,767,490 |  | 14,371,386 | [4]
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Corporate Bonds, fair value |  | 6,800,062 | [1],[2] | 4,509,285 | [3]
Corporate Bonds, gross unrealized holding losses |  | $ (47,208) | [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.

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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 https://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 https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI https://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value portion 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. + References No definition available. + Details
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