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Note 8 - Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30,
2015
  December 31,
2014
Raw materials   $ 5,422,506     $ 6,161,363  
Work-in-process     3,157,888       3,041,227  
Finished goods     3,137,849       3,204,186  
Total   $ 11,718,243     $ 12,406,776