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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
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pooled Separate Accounts      
Plan Invesments $ 19,924 $ 20,509 $ 20,496
U.S. Large-Cap Growth [Member]      
Pooled Separate Accounts      
Plan Invesments [1] 5,114 4,832  
U.S. Large-Cap Value [Member]      
Pooled Separate Accounts      
Plan Invesments [2] 4,619 4,939  
U.S. Small-Cap Blend [Member]      
Pooled Separate Accounts      
Plan Invesments [3] 2,094 2,163  
International blend [Member]      
Pooled Separate Accounts      
Plan Invesments [4] 2,079 1,966  
PIMCO Bond Fund [Member]      
Pooled Separate Accounts      
Plan Invesments [5] 5,671 6,274  
Prudential Short-term [Member]      
Pooled Separate Accounts      
Plan Invesments [6] $ 347 $ 335  
Fair Value, Inputs, Level 1 [Member] | U.S. Large-Cap Growth [Member]      
Pooled Separate Accounts      
Plan Invesments [1]  
Fair Value, Inputs, Level 1 [Member] | U.S. Large-Cap Value [Member]      
Pooled Separate Accounts      
Plan Invesments [2]  
Fair Value, Inputs, Level 1 [Member] | U.S. Small-Cap Blend [Member]      
Pooled Separate Accounts      
Plan Invesments [3]  
Fair Value, Inputs, Level 1 [Member] | International blend [Member]      
Pooled Separate Accounts      
Plan Invesments [4]  
Fair Value, Inputs, Level 1 [Member] | PIMCO Bond Fund [Member]      
Pooled Separate Accounts      
Plan Invesments [5]  
Fair Value, Inputs, Level 1 [Member] | Prudential Short-term [Member]      
Pooled Separate Accounts      
Plan Invesments [6]  
Fair Value, Inputs, Level 2 [Member]      
Pooled Separate Accounts      
Plan Invesments $ 19,924 $ 20,509  
Fair Value, Inputs, Level 2 [Member] | U.S. Large-Cap Growth [Member]      
Pooled Separate Accounts      
Plan Invesments [1] 5,114 4,832  
Fair Value, Inputs, Level 2 [Member] | U.S. Large-Cap Value [Member]      
Pooled Separate Accounts      
Plan Invesments [2] 4,619 4,939  
Fair Value, Inputs, Level 2 [Member] | U.S. Small-Cap Blend [Member]      
Pooled Separate Accounts      
Plan Invesments [3] 2,094 2,163  
Fair Value, Inputs, Level 2 [Member] | International blend [Member]      
Pooled Separate Accounts      
Plan Invesments [4] 2,079 1,966  
Fair Value, Inputs, Level 2 [Member] | PIMCO Bond Fund [Member]      
Pooled Separate Accounts      
Plan Invesments [5] 5,671 6,274  
Fair Value, Inputs, Level 2 [Member] | Prudential Short-term [Member]      
Pooled Separate Accounts      
Plan Invesments [6] $ 347 $ 335  
Fair Value, Inputs, Level 3 [Member] | U.S. Large-Cap Growth [Member]      
Pooled Separate Accounts      
Plan Invesments [1]  
Fair Value, Inputs, Level 3 [Member] | U.S. Large-Cap Value [Member]      
Pooled Separate Accounts      
Plan Invesments [2]  
Fair Value, Inputs, Level 3 [Member] | U.S. Small-Cap Blend [Member]      
Pooled Separate Accounts      
Plan Invesments [3]  
Fair Value, Inputs, Level 3 [Member] | International blend [Member]      
Pooled Separate Accounts      
Plan Invesments [4]  
Fair Value, Inputs, Level 3 [Member] | PIMCO Bond Fund [Member]      
Pooled Separate Accounts      
Plan Invesments [5]  
Fair Value, Inputs, Level 3 [Member] | Prudential Short-term [Member]      
Pooled Separate Accounts      
Plan Invesments [6]  
[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.