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Note 15 - Goodwill (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Goodwill, Impairment Loss   $ 1,400,000 $ 0
Goodwill, Ending Balance   $ 0 $ 1,473,176
Clever Container Company, L.L.C. [Member]      
Goodwill, Impairment Loss $ 220,000    
Flexo Universal [Member]      
Goodwill, Impairment Loss $ 1,033,000