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Note 10 - Fair Value of Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2019
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metal swaps
  $
-
    $
78
    $
-
    $
78
 
Total assets at fair value
 
$
-
   
$
78
   
$
-
   
$
78
 
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded customer derivative
  $
-
    $
78
    $
-
    $
78
 
Fixed interest rate hedge
   
 
     
3,196
     
 
     
3,196
 
Total liabilities recorded at fair value
 
$
-
   
$
3,274
   
$
-
   
$
3,274
 
   
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 June 30, 2019
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revolver
   
-
     
264,649
     
-
     
264,649
 
Total liabilities not recorded at fair value
 
$
-
   
$
264,649
   
$
-
   
$
264,649
 
   
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