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Note 12 - Long-Term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
May 12, 2011
Note 12 - Long-Term Debt (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 32,691,000   $ 50,000,000
Letters of Credit Outstanding, Amount 24,000,000    
Line of Credit Facility, Remaining Borrowing Capacity 7,885,000    
Unrestricted Cash Balance and Borrowing Capacity 26,559,000    
Number Of Days For Which Credit Facility Falls Below Specified Limit 5    
Debt Instrument, Interest Rate, Effective Percentage 3.00%    
Long-term Debt, Weighted Average Interest Rate 2.40% 2.40%  
Interest Expense, Debt 569,000 514,000  
Interest Costs Capitalized 0 0  
Interest Paid, Net 333,000 250,000  
Subject to Certain Conditions [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity     60,000,000
Mexican Subsidiaries [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Unrestricted Cash Balance 3,776,000    
Standby Letters of Credit [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000    
Letters of Credit Outstanding, Amount 806,000 999,000  
Cash [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Unrestricted Cash Balance 18,674,000    
Minimum [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Line Of Credit Facility Covenants Terms Credit Amount 6,000,000    
Maximum [Member]
      
Note 12 - Long-Term Debt (Details) [Line Items]      
Line Of Credit Facility Covenants Terms Credit Amount $ 8,000,000    
Fixed Charge Coverage Ratio 1.15