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Note 11 - Plant Consolidations (Details Textual)
3 Months Ended 9 Months Ended
Mar. 18, 2015
USD ($)
ft²
Jul. 16, 2014
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
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 1,500,000          
Newburyport, Massachusetts Facility [Member] | Lease Termination [Member]            
Restructuring and Related Cost, Expected Cost $ 360,000          
Newburyport, Massachusetts Facility [Member]            
Area of Real Estate Property | ft² 137,000          
Restructuring Charges $ 2,100,000          
Payments for Restructuring 2,000,000          
Restructuring and Related Cost, Expected Annual Cost Savings Amount $ 1,000,000          
Restructuring Costs     $ 25,000 $ 851,000 $ 203,000 $ 875,000
Restructuring Charges [Member]            
Restructuring Charges         941,000  
Selling, General and Administrative Expense         18,000  
Restructuring Charges     25,000 851,000 203,000 959,000
Restructuring Costs         1,900,000  
Number of Properties in Close Proximity   2        
Selling, General and Administrative Expense     $ 6,027,000 $ 5,604,000 $ 18,402,000 $ 18,404,000