Annual report pursuant to Section 13 and 15(d)

Note 9 - Discontinued Operations (Details Textual)

v3.6.0.2
Note 9 - Discontinued Operations (Details Textual)
 12 Months Ended
May 02, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Number of Previously Shut Down Locations   2  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   $ 53,323,000 $ 49,707,000
Number of Remediation Projects   3  
Accrual for Environmental Loss Contingencies   $ 925,000 900,000
Accrued Environmental Loss Contingencies, Current   677,000  
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   25,000  
Not Held for Sale [Member]      
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment     10,000
PFMI [Member]      
Disposal Group, Including Discontinued Operation, Consideration $ 450,000    
Disposal Group, Including Discontinued Operation, Consideration, At Closing, Gross 75,000    
Disposal Group, Including Discontinued Operation, Consideration, At Closing, Net 46,000    
Disposal Group, Including Discontinued Operation, Consideration, After Closing $ 375,000    
Disposal Group, Including Discontinued Operation, Consideration, Number of Monthly Installment Payments 60    
Disposal Group, Including Discontinued Operation, Consideration, Installment Payment $ 7,250    
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance   337,000  
PFMI [Member] | Loss Income from Discontinued Operations, Net of Taxes [Member]      
Asset Impairment Charges     150,000
PFMI [Member] | Current Assets Related to Discontinued Operations [Member]      
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance   69,000  
PFMI [Member] | Other Assets Related to Discontinued Operations [Member]      
Disposal Group, Including Discontinued Operation, Consideration, Remaining Balance   268,000  
PFSG [Member]      
Payment Resulting from Consent Order     201,000
PFSG [Member] | Arbitration with Contractor [Member]      
Loss Contingency, Loss in Period     407,000
PFSG [Member] | Interest Expense [Member] | Arbitration with Contractor [Member]      
Loss Contingency, Loss in Period     $ 400,000
PFSG and PFM [Member]      
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   $ 66,000