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Note 7 - Segment Information - Net Sales for Geographic Areas (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net sales $ 18,887,099 $ 18,388,381 $ 58,353,784 $ 57,818,996
UNITED STATES        
Net sales 16,200,989 15,551,725 49,910,923 49,380,463
CANADA        
Net sales 1,579,521 1,653,051 4,942,124 5,072,785
All Other Countries [Member]        
Net sales $ 1,106,589 $ 1,183,605 $ 3,500,737 $ 3,365,748