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Note 16 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 22 Months Ended
Mar. 31, 2019
Mar. 31, 2018
May 23, 2018
Share-based Payment Arrangement, Expense $ 4,251 $ 1,251  
Performance Shares [Member]      
Share-based Payment Arrangement, Expense 3,085 451  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Granted in 2016 [Member] | Expense Related to the Probable Achievement of the Threshold Goal [Member]      
Share-based Payment Arrangement, Expense 900 500  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Granted In 2017 [Member] | Expense Related to the Probable Achievement of the Threshold Goal [Member]      
Share-based Payment Arrangement, Expense 2,200 $ 0  
Performance Shares [Member] | Equity Incentive Plan 2011 [Member] | Granted in 2018 [Member]      
Share-based Payment Arrangement, Expense $ 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%