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Note 1 - Financial Statement Presentation (Tables)
9 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Principal Payments on Long-term debt:

2016
   
2,400
 
2017
   
9,600
 
2018
   
18,900
 
2019
   
21,900
 
2020
   
17,100
 
2021
   
14,700
 
2022
   
14,400
 
2023
   
11,400
 
Total
 
$
110,400