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Note 5 - Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Common Stock, Shares, Outstanding, Ending Balance   40,082,467   39,559,366
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   5,900,000    
Allocated Share-based Compensation Expense, Total   $ 551 $ 2,100  
Noncash Transaction, Conversion of Common Unit Options, Number of Common Stock Options 937,424      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 5.34      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     2,100  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   2 years 73 days    
Restricted Stock [Member]        
Allocated Share-based Compensation Expense, Total   $ 551 $ 0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 5,900    
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year    
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years