Note 26 - Reserve Roll Forwards - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance [Table Text Block]
    2015 Additions   
   

Balance at

January 1,

2015

    

Charged to

Cost and

Expense

    

Charged to

Other

Accounts

    

Deductions

    

Balance at

December

31, 2015

  

Reserve for:

                                        

Doubtful accounts and returns

   $ -     $ 37     $ -     $ 37     $ -  

LIFO inventory

     8,342       -       -       4,840       3,502  

Aged and obsolete inventory

     633       -       -       87       546  

Deferred tax valuation allowance

     -       -       -       -       -  

Aged and obsolete supplies and parts

     949       38       -       -       987  
    $ 9,924     $ 75     $ -     $ 4,964     $ 5,035  
    2014 Additions  
   

Balance at
January 1,
2014

    

Charged to
Cost and
Expense

    

Charged to
Other
Accounts

     Deductions    

Balance at
December
31, 2014

  

Reserve for:

                                        

Doubtful accounts and returns

   $ -     $ 46     $ -     $ 46     $ -  

LIFO inventory

     9,287       -       -       945       8,342  

Aged and obsolete inventory

     408       225       -       -       633  

Deferred tax valuation allowance

     -       -       -       -       -  

Aged and obsolete supplies and parts

     945       4       -       -       949  
    $ 10,640     $ 229     $ -     $ 945     $ 9,924  
    2013 Additions  
   

Balance at

January 1,

2013

    

Charged to

Cost and

Expense

    

Charged to

Other

Accounts

    

Deductions

    

Balance at

December

31, 2013

  

Reserve for:

                                        

Doubtful accounts and returns

   $ -     $ -     $ -     $ -     $ -  

LIFO inventory

     12,201       -       -       2,914       9,287  

Aged and obsolete inventory

     260       148       -       -       408  

Deferred tax valuation allowance

     -       -       -       -       -  

Aged and obsolete supplies and parts

     960       -       -       15       945  
    $ 13,421     $ 148     $ -     $ 2,929     $ 10,640