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Note 15 - Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
May 18, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Nonqualified Stock Option [Member] | Equity Incentive Plan 2011 [Member] | CEO and COO [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 1,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years        
Sharebased Compensation Arrangement by Sharebased Payment Award Expected to Vest Immediately Threshold Trading Days 20 days        
Sharebased Compensation Arrangement by Sharebased Payment Award Expected to Vest Immediately threshold Consecutive Trading Days 30 days        
Sharebased Compensation Arrangement by Sharebased Payment Award Expected to Vest Immediately Threshold Percentage of Stock Price Trigger 120.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.62        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 11,200,000   $ 11,200,000  
Allocated Share-based Compensation Expense   $ 0 $ 2,500,000 $ 5,000,000 $ 3,700,000
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Target Goal Number of Shares   100,000   100,000  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Chief Operating Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Target Goal Number of Shares   100,000   100,000  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Chief Financial Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Target Goal Number of Shares   25,000   25,000  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Minimum [Member] | 5% to 10% Vesting Threshold [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Performance Revenues that Exceed Base Revenues       5.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Minimum [Member] | 20% Vesting Threshold [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Performance Revenues that Exceed Base Revenues       20.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Performance Revenues that Exceed Base Revenues       10.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Maximum [Member] | 5% to 10% Vesting Threshold [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Performance Revenues that Exceed Base Revenues       10.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Performance Revenues that Exceed Base Revenues       20.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | 5% to 10% Vesting Threshold [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Goal Number of Shares       50.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | 20% Vesting Threshold [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Goal Number of Shares       200.00%  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Pro Forma [Member]          
Allocated Share-based Compensation Expense   $ 10,800,000      
Performance Shares [Member] | Equity Incentive Plan 2011 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years      
Allocated Share-based Compensation Expense   $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Average Gross Margin of Home Sales, Percentage, Minimum   15.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 24.08   $ 24.08  
Share Price $ 28.45        
Allocated Share-based Compensation Expense   $ 473,000 $ 3,998,000 $ 6,636,000 $ 6,589,000