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Note 6 - Leases (Details Textual) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($) | Jun. 30, 2020
Operating Lease, Payments | $ | $ 1.3 | $ 1.4 |
HONG KONG |  |  |
Area of Land (Square Foot) | 7,300 |  |
Rolling Hills Estates [Member] |  |  |
Area of Land (Square Foot) | 4,900 |  |
Lessee, Operating Lease, Renewal Term (Year) |  |  | 5 years
Richmond, British Columbia [Member] |  |  |
Area of Land (Square Foot) | 1,600 |  |
Metuchen, New Jersey [Member] |  |  |
Area of Land (Square Foot) | 2,000 |  |
CHINA |  |  |
Lessee, Number of Branches | 7 |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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