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Note 5 - Senior Credit Facility (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal Payments    
2018   $
3,450
 
2019    
6,900
 
2020    
6,900
 
2021    
2,300
 
         
Total   $
19,550