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Note 5 - Senior Credit Facility (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal Payments    
2018   $
 
2019    
5,000
 
2020    
12,000
 
2021    
12,000
 
2022    
1,000
 
         
Total   $
30,000