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Note 14 - Foreign Revenues and Operations (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Year ended December 31,
(in thousands)
 
201
5
 
 
201
4
 
Foreign Countries:
               
European Union
  $ 128     $ 51  
Other
    4       15  
Subtotal
    132       66  
United States
    4,650       4,121  
Total
  $ 4,782     $ 4,187