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Note 12 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The total minimum future lease payments are as follows:

12 Months Ending March 31,
 
Amount
 
2019
 
$
361,620
 
2020
   
15,360
 
2021
   
-
 
2022
   
-
 
2023
   
-
 
Thereafter
   
-
 
Total
 
$
376,980