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Note 2 - Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2013
Note 2 - Accounting Policies (Tables) [Line Items]  
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
   

Six Months Ended June 30,

 

Income statement data

 

2013

   

2012

 
                 

Revenue

  $ 60,845     $ 63,502  

Gross profit

    14,699       17,393  

Net income

    7,784       8,877  

Equity in earnings of affiliated companies

    2,212       2,387  
Balance Sheet [Member]
 
Note 2 - Accounting Policies (Tables) [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]

Balance sheet data

 

June 30,

2013

   

December 31,

2012

 
                 

Current assets

  $ 46,049     $ 65,251  

Non-current assets

    50,612       47,086  

Current liabilities

    29,399       45,604  

Non-current liabilities

    23,699       23,169  
Income Statement [Member]
 
Note 2 - Accounting Policies (Tables) [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]
   

Six Months Ended June 30,

 

Income statement data

 

2013

   

2012

 
                 

Revenue

  $ 38,429     $ 41,559  

Gross profit

    6,645       6,097  

Net income

    467       433