Note 21 - Segment Data (Details Textual)	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Operating Segments	2
Revenue from Contract with Customer, Including Assessed Tax	$ 87,891,000	$ 87,969,000
International Operation [Member]
Export Sales	7,239,000	4,155,000
Revenues, Total	40,536,000	39,744,000
Long-Lived Assets	6,669,000	7,162,000
Net Assets, Ending Balance	9,899,000	6,495,000
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0

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