Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	$ 16,605		$ 14,325
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	1,319		462
Cash [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	1,319		462
Equity Securities US Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	8,091		6,470
Equity Securities US Companies [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	8,091		6,470
Equity Securities International Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	137		112
Equity Securities International Companies [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	137		112
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	2,490	[1]	1,411	[1]
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year		[1]		[1]
Equity Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year		[1]		[1]
Equity Mutual Funds [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	2,490	[1]	1,411	[1]
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	358		366
US Government Corporations and Agencies Securities [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	358		366
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	398		435
US States and Political Subdivisions Debt Securities [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	398		435
Corporate Bonds-Investment Grade [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year		[2]		[2]
Corporate Bonds-Investment Grade [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	3,812	[2]	4,956	[2]
Corporate Bonds-Investment Grade [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year		[2]		[2]
Corporate Bonds-Investment Grade [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	3,812	[2]	4,956	[2]
Corporate Bonds-Below Investment Grade [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year				[3]
Corporate Bonds-Below Investment Grade [Member] | Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year			113	[3]
Corporate Bonds-Below Investment Grade [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year				[3]
Corporate Bonds-Below Investment Grade [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year			113	[3]
Fair Value, Inputs, Level 1 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	12,037		8,455
Fair Value, Inputs, Level 2 [Member]
Note 8 - Employee Benefit Plan (Details) - Fair Value Measurements [Line Items]
Fair value of plan assets at end of year	$ 4,568		$ 5,870

[1] This category comprises actively managed equity funds invested in large-cap and mid-cap U.S. companies.

[2] This category represents investment grade bonds of U.S. issuers from diverse industries.

[3] This category represents bonds from U.S. issuers from diverse industries that were purchased at investment grade, but which have fallen below investment grade.