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Note 3 - Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
2016
   
2015
 
Prepaid rent
 
$
7,191
   
$
7,852
 
Short-term investments
 
 
-
   
 
1,458
 
Other
 
 
5,546
   
 
7,002
 
Total
 
$
12,737
   
$
16,312