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Note 19 - Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Balance $ 26,098,000  
Foreign currency translation adjustments, net of tax of $267 and $0 in 2017 and 2016, respectively 419,000 $ (1,780,000)
Balance 16,930,000 26,098,000
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (11,334,000) (9,554,000)
Foreign currency translation adjustments, net of tax of $267 and $0 in 2017 and 2016, respectively 419,000 (1,780,000)
Net actuarial gain for the year 0 0
Amortization for the year 0 0
Balance (10,915,000) (11,334,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (15,264,000) (16,206,000)
Foreign currency translation adjustments, net of tax of $267 and $0 in 2017 and 2016, respectively 0 0
Net actuarial gain for the year 205,000 164,000
Amortization for the year 423,000 778,000
Balance (14,636,000) (15,264,000)
AOCI Attributable to Parent [Member]    
Balance (26,598,000) (25,760,000)
Foreign currency translation adjustments, net of tax of $267 and $0 in 2017 and 2016, respectively 419,000 (1,780,000)
Net actuarial gain for the year 205,000 164,000
Amortization for the year 423,000 778,000
Balance $ (25,551,000) $ (26,598,000)