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Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Product sales, net | $ 2,248,845 | $ 2,597,598
UNITED STATES |  |
Product sales, net | 1,316,998 | 1,389,323
Rest of World [Member] |  |
Product sales, net | 931,847 | 1,208,275
Instruments [Member] | UNITED STATES |  |
Product sales, net | 213,875 | 225,274
Instruments [Member] | Rest of World [Member] |  |
Product sales, net | 282,087 | 398,955
Handpieces [Member] | UNITED STATES |  |
Product sales, net | 1,086,433 | 1,140,978
Handpieces [Member] | Rest of World [Member] |  |
Product sales, net | 648,368 | 793,116
Accessories [Member] | UNITED STATES |  |
Product sales, net | 16,690 | 23,071
Accessories [Member] | Rest of World [Member] |  |
Product sales, net | 1,392 | 16,204
Dental Segment [Member] |  |
Product sales, net | 2,241,425 | 2,591,398
Dental Segment [Member] | UNITED STATES |  |
Product sales, net | 1,310,998 | 1,387,123
Dental Segment [Member] | Rest of World [Member] |  |
Product sales, net | 930,427 | 1,204,275
Dental Segment [Member] | Instruments [Member] | UNITED STATES |  |
Product sales, net | 213,875 | 224,274
Dental Segment [Member] | Instruments [Member] | Rest of World [Member] |  |
Product sales, net | 282,087 | 398,955
Dental Segment [Member] | Handpieces [Member] | UNITED STATES |  |
Product sales, net | 1,080,433 | 1,139,778
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |
Product sales, net | 646,948 | 789,116
Dental Segment [Member] | Accessories [Member] | UNITED STATES |  |
Product sales, net | 16,690 | 23,071
Dental Segment [Member] | Accessories [Member] | Rest of World [Member] |  |
Product sales, net | 1,392 | 16,204
Medical Segment [Member] |  |
Product sales, net | 7,420 | 6,200
Medical Segment [Member] | UNITED STATES |  |
Product sales, net | 6,000 | 2,200
Medical Segment [Member] | Rest of World [Member] |  |
Product sales, net | 1,420 | 4,000
Medical Segment [Member] | Instruments [Member] | UNITED STATES |  |
Product sales, net | 0 | 1,000
Medical Segment [Member] | Instruments [Member] | Rest of World [Member] |  |
Product sales, net | 0 | 0
Medical Segment [Member] | Handpieces [Member] | UNITED STATES |  |
Product sales, net | 6,000 | 1,200
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |
Product sales, net | 1,420 | 4,000
Medical Segment [Member] | Accessories [Member] | UNITED STATES |  |
Product sales, net | 0 | 0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member] |  |
Product sales, net | $ 0 | $ 0

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
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