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Note 2 - Accounting Policies (Details)
 3 Months Ended 24 Months Ended 3 Months Ended
Mar. 31, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2013
EUR (€)
Mar. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Dec. 31, 2013
USD ($)
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Jun. 30, 2013
Insituform Germany [Member]
Mar. 31, 2014
WCU [Member]
Mar. 31, 2014
Delta Double Jointing [Member]
Mar. 31, 2014
Bayou Coating [Member]
USD ($)
Jun. 30, 2013
Bayou Coating [Member]
USD ($)
Note 2 - Accounting Policies [Line Items]                            
Sale of interests in German joint venture $ 9,065,000     $ 0                    
Equity Method Investment, Other than Temporary Impairment                           2,700,000
Equity Method Investment Other Than Temporary Impairment Net Of Tax                           1,800,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) 677,000     902,000                 1,200,000  
Proceeds from Equity Method Investment, Dividends or Distributions 684,000     0                    
Gain (Loss) on Sale of Equity Investments (472,000)     0                    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 1,000,000     6,500,000                    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (1,000,000)     (600,000)                    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (200,000)     (200,000)                    
Noncontrolling Interest, Ownership Percentage by Parent                   50.00%   59.00%    
Total consideration recorded   18,300,000 14,000,000                      
Gain (Loss) on Disposition of Business   11,300,000                        
Business Acquisition, Transaction Costs   500,000                        
Long-term Purchase Commitment, Amount (in Pounds)         3,600,000 2,300,000                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                     49.00% 41.00% 51.00%  
Payments to Noncontrolling Interests 617,000     0                    
Equity Method Investment, Ownership Percentage               20.00% 50.00%          
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 0           $ 9,101,000