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Note 9 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Detail) (USD $)
 1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended 60 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Aug. 31, 2011
Mar. 31, 2013
Mar. 31, 2012
Jul. 31, 2016
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2009
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Apr. 30, 2013
Final Payment [Member]
RLW [Member]
Dec. 31, 2012
Aggregate Industries-SWR [Member]
Dec. 31, 2012
RHB [Member]
Dec. 31, 2012
RHB [Member]
Apr. 27, 2012
RHB [Member]
Mar. 30, 2012
RLW [Member]
Mar. 31, 2012
RLW [Member]
Apr. 30, 2013
RLW [Member]
Sep. 30, 2012
RLW [Member]
Dec. 31, 2012
RLW [Member]
Noncontrolling Interest, Description                       six                
Deferred Revenue         $ 25,000,000                              
Non-Compete Agreement Term         2 years                              
Noncontrolling Interest, Ownership Percentage by Parent                         50.00% 50.00% 50.00%         20.00%
Long-term Line of Credit                         5,000,000 5,000,000            
Noncontrolling Interests Offer To Buy Percentage                           50.00%            
Noncontrolling Interests Offer To Sell Percentage                           50.00%            
Adjustments to Additional Paid in Capital, Other                         233,000 3,000,000            
Business Acquisition, Cost of Acquired Entity, Cash Paid                         9,800,000 9,800,000            
Business Acquisition, Purchase Price Allocation, Deferred Tax Liabilities, Noncurrent                         360,000 360,000            
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 80.00%                                      
Business Acquisition Additional Price Payments 5,000,000                   509,000             23.1    
Business Acquisition Additional Price Payments Term 5 years                                      
Business Acquisition Earn-Out Percentage 50.00%                                      
Business Acquisition Earn-Out Calculated Floor       1,200,000   2,000,000                            
Forcasted EBITDA Percentage   0.00%         38.00%                          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   2,200,000                                    
Business Acquisition Undiscounted Earn-Out Liability   2,300,000                                    
Business Acquisition Undiscounted Earn-Out Liability Increase   2,700,000                                    
EBITDA Earn-Out Increase Floor   5,400,000                                    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners               20.00%                        
Business Acquisition Purchase Price Multiplier                 4 4.5                    
Interest Expense, Other     248,000                                  
Increase (Decrease) in Put/Call Liability                                 463,000      
Other Tax Expense (Benefit)         162,000                              
Noncontrolling Owners' Interest In Earnings of Subsidiaries and Joint Ventures   161,000                                    
  25,000                                    
Income Attributable to Other Noncontrolling Interests   186,000                                    
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest                               6.7        
Increase (Decrease) in Income Taxes                                     $ 2.4