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Summary of Significant Accounting Policies (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2011
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
Pension_Plan
Customer
Dec. 31, 2011
Customer
Dec. 31, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]                
Carrying value of notes receivable and investment           $ 0    
Proceeds from Sale of Equity Method Investment in NWPA 800,000              
Purchases of property and equipment from NWPA       200,000     200,000  
Intercompany balances       0     0  
Net sales recognized under percentage of completion accounting     800,000          
Cost of sales reduction   200,000 100,000 100,000   400,000    
Proceeds from sale of traffic systems assets         13,700,000      
Gain on sale of traffic systems assets         2,900,000      
Goodwill written off related to sale of traffic systems assets             973,000  
Restricted cash held in the escrow account       900,000   900,000 900,000  
Goodwill balance, Tubular Products Group       20,478,000   20,478,000 20,478,000 21,451,000
Number of defined benefit pension plans           2    
Nonrecurring fair value measurement impairment charge           0 4,100,000  
Pension liability adjustment, tax effect           1,244,000 1,294,000  
Net deferred gain (loss) on cash flow derivatives, tax effect           50,000 44,000  
Number of customers with balances in excess of 10% of total accounts receivable           0 1  
Customer with receivable balance in excess of 10% (1)           10.00%    
Customer with receivable balance in excess of 10% (2)             13.00%  
Advanced deposits       2,000,000   9,400,000 2,000,000  
Accumulated impairment charges           $ 0    
Minimum percentage of likelihood of tax benefit being realized upon settlement           50.00%