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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant, and Equipment Useful Lives [Table Text Block]
   
Useful Lives
 
Leasehold improvements  
Lesser of useful life or
term of lease
 
Office equipment and furniture (in years)
 
3
 
Machinery and
equipment (in years)
 
3