Note 4 - Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Note 4 - Long-Term Debt (Details) [Line Items]
Long-term Line of Credit	$ 16.8
Letters of Credit Outstanding, Amount	9.2
Line of Credit Facility, Remaining Borrowing Capacity	24.1
Credit Facility [Member]
Note 4 - Long-Term Debt (Details) [Line Items]
Long-term Debt, Weighted Average Interest Rate	0.99%
Minimum [Member]
Note 4 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	50
Maximum [Member]
Note 4 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 75