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Note 4 - Senior Credit Facility (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal Payments
2018   $
6,900
 
2019    
6,900
 
2020    
6,900
 
2021    
2,300
 
Total   $
23,000