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Note 8 - Indebtedness (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
    December 31,
    2019   2018
Revolving credit facility   $
-
    $
8,000
 
Term loan    
-
     
17,143
 
Total long-term debt    
-
     
25,143
 
Current portion    
-
     
(2,857
)
Long-term debt, excluding current portion   $
-
    $
22,286