Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Employee Pension Plan’s Assets that are Carried at Fair Value, and the Method Used to Determine Fair Value (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Pooled Separate Accounts
Plan Invesments	$ 20,509		$ 20,496		$ 17,300
U.S. large-cap growth [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[1]
U.S. large-cap growth [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	4,832		4,609	[1]
U.S. large-cap growth [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[1]
U.S. large-cap growth [Member]
Pooled Separate Accounts
Plan Invesments	4,832	[1]	4,609	[1]
U.S. large-cap value [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[2]
U.S. large-cap value [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	4,939		4,625	[2]
U.S. large-cap value [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[2]
U.S. large-cap value [Member]
Pooled Separate Accounts
Plan Invesments	4,939	[2]	4,625	[2]
U.S. Small-Cap Blend [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[3]
U.S. Small-Cap Blend [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	2,163		2,536	[3]
U.S. Small-Cap Blend [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[3]
U.S. Small-Cap Blend [Member]
Pooled Separate Accounts
Plan Invesments	2,163	[3]	2,536	[3]
International blend [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[4]
International blend [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	1,966		2,336	[4]
International blend [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[4]
International blend [Member]
Pooled Separate Accounts
Plan Invesments	1,966	[4]	2,336	[4]
PIMCO bond fund [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[5]
PIMCO bond fund [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	6,274		5,993	[5]
PIMCO bond fund [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[5]
PIMCO bond fund [Member]
Pooled Separate Accounts
Plan Invesments	6,274	[5]	5,993	[5]
Prudential short term [Member] | Fair Value, Inputs, Level 1 [Member]
Pooled Separate Accounts
Plan Invesments				[6]
Prudential short term [Member] | Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	335		397	[6]
Prudential short term [Member] | Fair Value, Inputs, Level 3 [Member]
Pooled Separate Accounts
Plan Invesments				[6]
Prudential short term [Member]
Pooled Separate Accounts
Plan Invesments	335	[6]	397	[6]
Fair Value, Inputs, Level 2 [Member]
Pooled Separate Accounts
Plan Invesments	$ 20,509		$ 20,496

[1] Comprised of large-cap stocks seeking to outperform, over the long term, the Russell 1000 Growth Index. The portfolio will typically hold between 55 and 70stocks.

[2] Comprised of large-cap stocks seeking to outperform the Russell 1000 Value benchmark over the rolling three and five year periods, or a full market cycle,whichever is longer.

[3] Comprised of stocks with market capitalization of between $100 million and the market capitalization of the largest stock in the Russell 2000 index at the timeof purchase. The portfolio will typically hold between 40 and 100 stocks.

[4] Comprised of non-U.S. domiciled stocks. The portfolio will typically hold between 80 and 90 stocks.

[5] Comprised of a portfolio of fixed income securities including U.S agency mortgage-backed securities and investment grade bonds.

[6] Comprised of money market instruments with an emphasis on safety and liquidity.