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Note 14 - Fair Value of Pension Plan's Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair values of the Pension Plan's assets $ 40,310 $ 42,267
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair values of the Pension Plan's assets
Mutual Fund [Member]    
Fair values of the Pension Plan's assets $ 40,310 $ 42,267
Other Investment [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair values of the Pension Plan's assets
Other Investment [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair values of the Pension Plan's assets $ 3,675 $ 3,185
Other Investment [Member]    
Fair values of the Pension Plan's assets 3,675 3,185
Fair Value, Inputs, Level 1 [Member]    
Fair values of the Pension Plan's assets 40,310 42,267
Fair Value, Inputs, Level 3 [Member]    
Fair values of the Pension Plan's assets 3,675 3,185
Fair values of the Pension Plan's assets $ 43,985 $ 45,452