Note 9 - Retirement Plans (Details) (USD $)	12 Months Ended		12 Months Ended								0 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Inflation [Member] Active Defined Benefit Pension Plan [Member]	Dec. 31, 2013 Risk-free Rate of Return [Member] Active Defined Benefit Pension Plan [Member]	Dec. 31, 2013 Risk Premium [Member] Active Defined Benefit Pension Plan [Member]	Dec. 31, 2013 Active Defined Benefit Pension Plan [Member]	Dec. 31, 2012 Active Defined Benefit Pension Plan [Member]	Dec. 31, 2011 Active Defined Benefit Pension Plan [Member]	Dec. 31, 2013 Acquired Pension Plans [Member]	Dec. 31, 2012 Acquired Pension Plans [Member]	Dec. 09, 2008 Capital Accumulation Plan [Member]	May 02, 2007 Capital Accumulation Plan [Member]	Dec. 31, 2013 Capital Accumulation Plan [Member]	Dec. 31, 2013 Collective Bargaining [Member]	Dec. 31, 2013 Minimum [Member]
Note 9 - Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation						$ 72,200,000	$ 71,800,000
Inflation Rate			3.00%
Fair Value Assumptions, Risk Free Interest Rate				1.00%
Risk Premium Rate					3.00%
Number of Underfunded Pension Plans	2
Defined Benefit Plan, Fair Value of Plan Assets	58,063,000	46,662,000				58,063,000	46,662,000	35,011,000	5,500,000	4,900,000
Defined Benefit Plan, Benefit Obligation						83,533,000	83,236,000	67,033,000	6,900,000	7,400,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year															$ 6,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)											2,000,000	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)													1,595,753
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match														50.00%
Capital Accumulation Plan Contributions Vesting Period	5 years