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Note 15 - Activity of Business Segments - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Details) - Reportable Geographical Components [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Net sales by geographic region |  |
Consolidated sales | $ 102,700,000 | $ 46,665,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | 4,353,000 | 3,943,000
UNITED STATES |  |
Net sales by geographic region |  |
Consolidated sales | 90,495,000 | 45,748,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | 2,787,000 | 2,450,000
International Member |  |
Net sales by geographic region |  |
Consolidated sales | 12,205,000 | 917,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | $ 1,566,000 | $ 1,493,000

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