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Note 10 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member] | 6 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Dec. 31, 2022
DENMARK |  |
Concentration Risk, Percentage | 97.00% | 65.00%
UNITED STATES |  |
Concentration Risk, Percentage | 1.00% | 33.00%
CHINA |  |
Concentration Risk, Percentage | 2.00% | 2.00%

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