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Note 11 - Geographical Sales (Details) - Schedule of Sales by Geographic Region - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Geographical Areas        
Sales $ 9,322,836 $ 16,747,827 $ 24,577,846 $ 63,159,929
North America [Member]        
Geographical Areas        
Sales 4,247,435 13,237,312 12,375,085 40,224,090
CHINA        
Geographical Areas        
Sales 4,958,128 0 11,792,589 0
AUSTRALIA        
Geographical Areas        
Sales 0 548,580 0 11,075,268
Asia [Member]        
Geographical Areas        
Sales [1] 0 2,816,233 0 11,677,878
Other Countries [Member]        
Geographical Areas        
Sales $ 117,273 $ 145,702 $ 410,172 $ 182,693
[1] excluding China