Annual report pursuant to Section 13 and 15(d)

Note 5 - Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details)

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Note 5 - Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Plan assets by category $ 5,356 $ 4,937 $ 4,551
Fair Value, Inputs, Level 1 [Member]      
Plan assets by category 5,356 4,937  
Money Market Funds [Member]      
Plan assets by category 165 1,048  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan assets by category 165 1,048  
Equity Securities [Member]      
Plan assets by category 670 445  
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan assets by category 670 445  
Equity Funds [Member]      
Plan assets by category 2,468 1,684  
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan assets by category 2,468 1,684  
Fixed Income Funds [Member]      
Plan assets by category 2,053 1,760  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Plan assets by category $ 2,053 $ 1,760