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Note 6 - Fair Value Measurements
3 Months Ended
Mar. 31, 2017
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
Note
6.
Fair Value Measurements
 
Fair Value Disclosures for Financial Assets and Liabilities
We determined the carrying value of cash equivalents, accounts receivable, trade payables, accrued liabilities and short-term borrowings approximate their fair values because of the nature of their terms and current market rates of these instruments. We believe the carrying value of our variable rate debt approximates fair value.
 
We have fixed rate debt and calculate the estimated fair value of our fixed rate debt using a discounted cash flow methodology. Using estimated current interest rates based on a similar risk profile and duration (Level
2),
the fixed cash flows are discounted and summed to compute the fair value of the debt. As of
March
 
31,
2017,
this debt had maturity dates between
May
 
1,
2018
and
December
 
31,
2050.
There were no changes to our valuation techniques during the
three
-month period ended
March
 
31,
2017.
 
A summary of the aggregate carrying values and fair values of our long-term fixed interest rate debt is as follows (in thousands):
 
 
 
March 31, 2017
 
 
December 31, 2016
 
Carrying value
  $
296,539
    $
286,660
 
Fair value
   
299,623
     
293,522