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Note 16 - Summary of Fair Values of Pension Plan Assets (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]    
Plan Asset Categories $ 1,001,000 $ 1,270,000
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]    
Plan Asset Categories 306,000 292,000
Fair Value, Inputs, Level 1 [Member] | US Large Cap [Member]    
Plan Asset Categories 7,065,000 8,105,000
Fair Value, Inputs, Level 1 [Member] | US Mid Cap [Member]    
Plan Asset Categories 1,012,000 1,245,000
Fair Value, Inputs, Level 1 [Member] | US Small Cap [Member]    
Plan Asset Categories 496,000 504,000
Fair Value, Inputs, Level 1 [Member] | World Equity [Member]    
Plan Asset Categories 1,458,000 1,596,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]    
Plan Asset Categories 103,000 266,000
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]    
Plan Asset Categories 8,511,000 11,710,000
Fair Value, Inputs, Level 1 [Member]    
Plan Asset Categories 19,952,000 24,988,000
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | US Large Cap [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | US Mid Cap [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | World Equity [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]    
Plan Asset Categories 0 0
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]    
Plan Asset Categories 15,174,000 13,050,000
Fair Value, Inputs, Level 2 [Member]    
Plan Asset Categories 15,174,000 13,050,000
Plan Asset Categories $ 35,126,000 $ 38,038,000