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Note 15 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jul. 25, 2016
Mar. 31, 2018
Mar. 31, 2017
Allocated Share-based Compensation Expense, Total   $ 1,251 $ 595
Performance Shares [Member]      
Allocated Share-based Compensation Expense, Total   451
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Granted in 2016 [Member]      
Allocated Share-based Compensation Expense, Total   500 $ 0
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Granted In 2017 [Member]      
Allocated Share-based Compensation Expense, Total   $ 0  
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] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
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, Percentage of Performance Revenues that Exceed Base Revenues 10.00%    
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] | 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] | 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] | 20% Vesting Threshold [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Goal Number of Shares 200.00%