Note 8 - Income Taxes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Domestic Tax Authority [Member]	Dec. 31, 2012 Domestic Tax Authority [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member] Valuation Allowance, Operating Loss Carryforwards [Member]	Dec. 31, 2011 State and Local Jurisdiction [Member] Valuation Allowance, Operating Loss Carryforwards [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member]	Dec. 31, 2010 Interest Rate Swap [Member]	Dec. 31, 2009 Interest Rate Swap [Member]	Dec. 31, 2012 Valuation Allowance, Operating Loss Carryforwards [Member]	Dec. 31, 2011 Valuation Allowance, Operating Loss Carryforwards [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration						$ 250,200,000			$ 259,100,000
Deferred Tax Assets, Valuation Allowance		3,157,000	4,620,000				3,200,000	4,300,000				0	300,000
Valuation Allowance, Deferred Tax Asset, Change in Amount		(1,500,000)	(300,000)
Increase (Decrease) in Pension Plan Obligations		6,200,000	13,800,000	4,200,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		3,768,000	8,414,000	2,544,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax		2,400,000	5,400,000	1,600,000
Deferred Tax Liabilities, Gross, Noncurrent										0	6,300,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax				3,870,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax				2,500,000
Income Taxes Paid, Net		800,000	500,000
Proceeds from Income Tax Refunds				100,000	500,000
Accrued Income Taxes		1,900,000	2,800,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		1,600,000	2,600,000
Liability for Uncertain Tax Positions, Current		700,000	1,000,000
Unrecognized Tax Benefits, Period Increase (Decrease)	$ (100,000)