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Note 6 - Inventories
3 Months Ended
Mar. 31, 2015
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventories
 
As of March 31, 2015 and December 31, 2014, inventories consisted of the following:
 
 
 
March 31,
 
 
December 31,
 
 
 
2015
 
 
2014
 
                 
Raw materials
  $ 7,424,000     $ 6,436,000  
Work in process
    5,299,000       4,834,000  
Finished goods
    6,394,000       5,274,000  
    $ 19,117,000     $ 16,544,000