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Note 6 - Long-term Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Equipment Financing [Member] | Line of Credit [Member]
 
Note 6 - Long-term Debt (Details) [Line Items]  
Long-term Debt, Weighted Average Interest Rate 2.91%
Line of Credit [Member]
 
Note 6 - Long-term Debt (Details) [Line Items]  
Debt Instrument, Face Amount (in Dollars) $ 35,000,000
Debt Instrument, Basis Spread on Variable Rate 1.75%
Long-term Debt, Weighted Average Interest Rate 1.92%
Ratio of Indebtedness to Net Capital 2.15
Tangible Capital (in Dollars) 115,000,000
Letter of Credit [Member]
 
Note 6 - Long-term Debt (Details) [Line Items]  
Line of Credit Facility, Amount Outstanding (in Dollars) $ 1,101,000