Note 3 - Long-Term Debt	3 Months Ended
Note 3 - Long-Term Debt	Mar. 31, 2015
Notes to Financial Statements
Debt Disclosure [Text Block]	(3) Long-Term Debt We maintain a credit agreement that provides for an unsecured committed credit facility which matures in December 2019. The aggregate principal amount of the credit facility of $50.0 million may be increased at our option, subject to completion of signed amendments with the lender, up to a maximum aggregate principal amount of $75.0 million. At March 31, 2015, there was no outstanding principal balance on the credit facility. As of that date, we had outstanding standby letters of credit of $9.2 million and remaining borrowing availability of $40.8 million. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins. The weighted average interest rate for the facility was 0.84% at December 31, 2014, the last quarter-end date with an outstanding principal balance.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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