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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
2015
 
 
2014
 
                 
Raw materials
  $ 7,760,000     $ 6,436,000  
Work in process
    5,147,000       4,834,000  
Finished goods
    6,311,000       5,274,000  
    $ 19,218,000     $ 16,544,000