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Note 3 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 shares | Dec. 31, 2022 USD ($)
Allowance for Sales Returns |  |  | $ 0 |  | $ 179,000
Number of Operating Segments |  |  | 2 |  |
Cash, Uninsured Amount | $ 1,700,000 |  | $ 1,700,000 |  |
Marketable Securities, Current | 2,450,470 |  | 2,450,470 |  | 0
Accounts Receivable, Allowance for Credit Loss | $ 26,000 |  | $ 26,000 |  | 10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares | 73,730,921 | 70,975,420 | 72,374,693 | 70,480,706 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 3,930,654 | 8,135,704 |
US Treasury Securities [Member] |  |  |  |  |
Marketable Securities, Current | $ 2,400,000 |  | $ 2,400,000 |  |
Money Market Funds [Member] |  |  |  |  |
Cash Equivalents, at Carrying Value | $ 2,200,000 |  | $ 2,200,000 |  | $ 8,700,000

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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