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Note 5 - Senior Credit Facility (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal Payments        
2018   $
5,175
 
2019    
6,900
 
2020    
6,900
 
2021    
2,300
 
         
Total   $
21,275