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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
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Dec. 31, 2019 | Dec. 31, 2018
Net sales by geographic region |  |
Consolidated sales | $ 46,665,000 | $ 46,624,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | 3,943,000 | 3,244,000
UNITED STATES |  |
Net sales by geographic region |  |
Consolidated sales | 45,748,000 | 45,595,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | 2,450,000 | 2,528,000
International Member |  |
Net sales by geographic region |  |
Consolidated sales | 917,000 | 1,029,000
Long-lived assets by geographic region |  |
Consolidated long-lived assets | $ 1,493,000 | $ 716,000

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