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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 1 Months Ended 12 Months Ended
Mar. 30, 2014
USD ($)
Dec. 30, 2013
USD ($)
Jan. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mar. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Permalok Corporation [Member] | Other Long-term Liabilities [Member]                      
Business Combination, Contingent Consideration, Liability             $ 3,000,000 $ 2,700,000      
Permalok Corporation [Member]                      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (1,200,000)         0      
Noncontrolling Interest, Ownership Percentage by Parent   100.00%                  
Payments to Acquire Businesses, Net of Cash Acquired   $ 15,700,000                  
Goodwill, Acquired During Period   $ 5,300,000                  
Water Transmission Group [Member]                      
Number of Manufacturing Facilities             8        
Goodwill                   $ 5,300,000  
Disposal of OCTG Business [Member]                      
Proceeds from Sale of Productive Assets $ 42,700,000                    
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 13,500,000       $ 1,800,000            
Goodwill, Written off Related to Sale of Business Unit           $ 4,400,000   4,400,000      
Business Acquisition Purchase Price Amount Held In Escrow To Secure Indemnification Obligations 4,300,000         $ 4,300,000          
Repayments of Debt and Capital Lease Obligations $ 5,000,000                    
Business Acquisition, Transaction Costs         $ 1,800,000            
Proceeds from Divestiture of Businesses               29,800,000      
Escrow Deposit Released       $ 4,300,000              
Accrued Liability [Member]                      
Workers' Compensation Liability, Current             $ 1,200,000        
Expected Gain (Loss) on Uncompleted Contracts             (5,900,000)        
Accrual for Taxes Other than Income Taxes             1,300,000        
Pension and Other Long-term Liabilities [Member]                      
Workers' Compensation Liability, Noncurrent             $ 3,200,000        
Minimum [Member] | Land Improvements [Member]                      
Property, Plant and Equipment, Useful Life             15 years        
Minimum [Member] | Building [Member]                      
Property, Plant and Equipment, Useful Life             20 years        
Minimum [Member] | Machinery and Equipment [Member]                      
Property, Plant and Equipment, Useful Life             3 years        
Minimum [Member]                      
Finite-Lived Intangible Asset, Useful Life             3 years        
Maximum [Member] | Land Improvements [Member]                      
Property, Plant and Equipment, Useful Life             30 years        
Maximum [Member] | Building [Member]                      
Property, Plant and Equipment, Useful Life             40 years        
Maximum [Member] | Machinery and Equipment [Member]                      
Property, Plant and Equipment, Useful Life             30 years        
Maximum [Member]                      
Finite-Lived Intangible Asset, Useful Life             15 years        
Investments             $ 0 0      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             (211,000) (1,746,000)    
Book Overdrafts             $ 0 $ 900,000      
Number of Customers with Receivable Balance in Excess of Ten Percent of Receivables             0 1      
Goodwill             $ 0 $ 5,282,000 $ 25,760,000   $ 20,478,000
Number of Reportable Segments             2        
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax             (13,497,000)    
Goodwill, Written off Related to Sale of Business Unit               4,412,000      
Proceeds from Divestiture of Businesses             $ 4,300,000 $ 29,791,000    
Payments to Acquire Businesses, Net of Cash Acquired             $ 15,689,000    
Goodwill, Acquired During Period                 $ 5,282,000    
Business Combination, Contingent Consideration, Liability             $ 2,974,000 $ 2,679,000      
Workers' Compensation Liability             4,400,000        
Accrued Vacation, Current             $ 3,000,000 $ 2,200,000      
Change in Gross Profi Twhich Triggers Management Review             2.00%