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Note 9 - Inventories, Net of Continuing Operations (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
Raw materials
  $
1,555,838
    $
1,544,949
 
Work in process
   
3,171,759
     
3,110,296
 
Finished goods
   
8,431,874
     
9,766,060
 
In Transit
   
92,671
     
99,923
 
Allowance for excess quantities
   
(565,499
)    
(561,729
)
Total inventories
  $
12,686,643
    $
13,959,499