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Note 4 - Deferred Rent (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Deferred Rent [Table Text Block]
   
June 30,
2018
    
December 31,
2017
  
Landlord-funded leasehold improvements
   $
1,124,790
     $
1,124,790
  
Less accumulated amortization
    
(693,024
)
    
(629,525
)
Total
    
431,766
      
495,265
  
Straight line rent adjustment
    
121,278
      
127,158
  
Total deferred rent
   $
553,044
     $
622,423