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Note 10 - Fair Value of Assets and Liabilities (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Value of Items Recorded at Fair Value
 
   
As of March 31, 2019
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metal swaps
  $
-
    $
55
    $
-
    $
55
 
Total assets at fair value
 
$
-
   
$
55
   
$
-
   
$
55
 
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded customer derivative
  $
-
    $
55
    $
-
    $
55
 
Fixed interest rate hedge
   
 
     
1,457
     
 
     
1,457
 
Total liabilities recorded at fair value
 
$
-
   
$
1,512
   
$
-
   
$
1,512
 
   
Value of Items Recorded at Fair Value
 
   
As of December 31, 2018
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded customer derivatives
  $
-
    $
21
    $
-
    $
21
 
Total assets at fair value
 
$
-
   
$
21
   
$
-
   
$
21
 
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metals swaps
  $
-
    $
21
    $
-
    $
21
 
Total liabilities recorded at fair value
 
$
-
   
$
21
   
$
-
   
$
21
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Value of Items Not Recorded at Fair Value
 
   
As of March 31, 2019
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revolver
   
-
     
313,269
     
-
     
313,269
 
Total liabilities not recorded at fair value
 
$
-
   
$
313,269
   
$
-
   
$
313,269
 
   
Value of Items Not Recorded at Fair Value
 
   
As of December 31, 2018
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities:
                               
Revolver
  $
-
    $
302,530
    $
-
    $
302,530
 
Total liabilities not recorded at fair value
 
$
-
   
$
302,530
   
$
-
   
$
302,530