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Note 7 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
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, 2018
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metal swaps
  $
-
    $
278
    $
-
    $
278
 
Total assets at fair value
 
$
-
   
$
278
   
$
-
   
$
278
 
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded customer derivative
  $
-
    $
278
    $
-
    $
278
 
Total liabilities recorded at fair value
 
$
-
   
$
278
   
$
-
   
$
278
 
   
Value of Items Recorded at Fair Value
 
   
As of December 31, 2017
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metals swaps
  $
-
    $
382
    $
-
    $
382
 
Total assets at fair value
 
$
-
   
$
382
   
$
-
   
$
382
 
                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded customer derivatives
  $
-
    $
382
    $
-
    $
382
 
Interest rate swap (CTI)
   
-
     
5
     
-
     
5
 
Total liabilities recorded at fair value
 
$
-
   
$
387
   
$
-
   
$
387
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Value of Items Not Recorded at Fair Value
 
   
As of March 31, 2018
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revolver
   
-
     
248,955
     
-
     
248,955
 
Total liabilities not recorded at fair value
 
$
-
   
$
248,955
   
$
-
   
$
248,955
 
   
Value of Items Not Recorded at Fair Value
 
   
As of December 31, 2017
 
(in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities:
                               
IRB
  $
930
    $
-
    $
-
    $
930
 
Revolver
   
-
     
196,235
     
-
     
196,235
 
Total liabilities not recorded at fair value
 
$
930
   
$
196,235
   
$
-
   
$
197,165