Note 12 - Fair Value of Financial Instruments - Summary of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Reported Value Measurement [Member]
Short-Term Debt	$ (58,117)	$ (42,883)
Long-Term Debt including Current Maturities	(532,586)	(538,542)
Estimate of Fair Value Measurement [Member]
Short-Term Debt	(58,117)	(42,883)
Long-Term Debt including Current Maturities	$ (588,251)	$ (583,835)

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

No definition available.

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant