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Note 6 - Assets Held for Sale (Details Textual) - Transition of Production from the Broadway Plant [Member] - USD ($)
6 Months Ended 12 Months Ended
Apr. 13, 2020
Jul. 05, 2020
Dec. 31, 2020
Proceeds from Sale of Real Estate, Total $ 1,700,000    
Proceeds from Sale of Other Property, Plant, and Equipment     $ 268,000
Gain (Loss) on Disposition of Property Plant Equipment, Total   $ 958,000