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Note 19 - Plant Consolidation - Restructuring Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee severance     $ 196
Relocation     1,204
Lease termination     356
Total restructuring costs     1,756
Newburyport, Massachusetts Facility [Member]      
Employee severance 178
Relocation 63 420 1,138
Lease termination 356
Total restructuring costs $ 63 $ 420 1,672
Rancho Dominguez, California Facility [Member]      
Employee severance     18
Relocation     66
Lease termination    
Total restructuring costs     $ 84