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Note 19 - Product and Geographic Segment Data - Net Sales to Outside Customers (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Net Sales $ 40,537,030 $ 49,421,411
UNITED STATES    
Net Sales 32,019,000 40,553,000
MEXICO    
Net Sales $ 8,518,000 $ 8,868,000