Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - 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, 2012		Dec. 31, 2011	Dec. 31, 2010
Equity
Plan's Assets	$ 17,300		$ 15,421	$ 13,027
U.S. large-cap growth [Member] | Fair Value, Inputs, Level 1 [Member]
Equity
Plan's Assets	3,406
U.S. large-cap growth [Member]
Equity
Plan's Assets	3,406	[1]
U.S. large-cap value [Member] | Fair Value, Inputs, Level 1 [Member]
Equity
Plan's Assets	3,912
U.S. large-cap value [Member]
Equity
Plan's Assets	3,912	[2]
U.S. Small-Cap Blend [Member] | Fair Value, Inputs, Level 1 [Member]
Equity
Plan's Assets	1,980
U.S. Small-Cap Blend [Member]
Equity
Plan's Assets	1,980	[3]
International blend [Member] | Fair Value, Inputs, Level 1 [Member]
Equity
Plan's Assets	1,837
International blend [Member]
Equity
Plan's Assets	1,837	[4]
PIMCO bond fund [Member] | Fair Value, Inputs, Level 2 [Member]
Equity
Plan's Assets	5,820
PIMCO bond fund [Member]
Equity
Plan's Assets	5,820	[5]
Prudential short term [Member] | Fair Value, Inputs, Level 2 [Member]
Equity
Plan's Assets	345
Prudential short term [Member]
Equity
Plan's Assets	345	[6]
Fair Value, Inputs, Level 1 [Member]
Equity
Plan's Assets	11,135
Fair Value, Inputs, Level 2 [Member]
Equity
Plan's Assets	$ 6,165

[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 70 stocks.

[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 time of 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.