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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 |  |

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