Note 12 - Fair Value (Details) - Fair Value Measurements for Pension Plan Assets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	$ 21,445	[1]	$ 16,009	[1]
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	0	[1]	0	[1]
Mutual Funds [Member] | Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	21,445	[1]	16,009	[1]
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	5,626		6,510
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	6,940		7,295
US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	12,566		13,805
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	0		0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	5,794		8,653
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	5,794		8,653
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	14,889		15,001
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	0		0
Common Stock [Member] | Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	14,889		15,001
Common Trust Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	0		0
Common Trust Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	9,568		10,033
Common Trust Funds [Member] | Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	9,568		10,033
Fair Value, Inputs, Level 1 [Member]
Pension plan assets:
Pension Plan Assets	41,960		37,520
Fair Value, Inputs, Level 2 [Member]
Pension plan assets:
Pension Plan Assets	22,302		25,981
Estimate of Fair Value Measurement [Member]
Pension plan assets:
Pension Plan Assets	$ 64,262		$ 63,501

[1] Includes mutual funds, money market funds, cash, cash equivalents, and accrued interest.