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Note 21 - Segment Information (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of Operating Segments	2
Revenue from Contract with Customer, Including Assessed Tax	$ 82,346,000	$ 87,891,000
International Operation [Member]
Export Sales	3,423,000	7,239,000
Revenues, Total	29,812,000	40,536,000
Long-Lived Assets	5,819,000	6,669,000
Net Assets, Ending Balance	14,344,000	9,899,000
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0

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