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Note 11 - Plant Consolidations (Details Textual)
3 Months Ended 6 Months Ended
Mar. 18, 2015
USD ($)
ft²
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Restructuring Charges   $ 63,000 $ 55,000 $ 63,000 $ 178,000
Newburyport, Massachusetts Facility [Member]          
Area of Real Estate Property | ft² 137,000        
Restructuring Charges $ 2,100,000        
Payments for Restructuring 2,000,000        
Newburyport, Massachusetts Facility [Member] | Employee Severance Payments and Relocation Costs [Member]          
Restructuring and Related Cost, Expected Cost 180,000        
Newburyport, Massachusetts Facility [Member] | Moving and Vacating Expense [Member]          
Restructuring and Related Cost, Expected Cost 1,600,000        
Newburyport, Massachusetts Facility [Member] | Lease Termination [Member]          
Restructuring and Related Cost, Expected Cost $ 360,000