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Note 5 - Acquisition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 8 Months Ended 12 Months Ended
May 04, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total   $ (4,552) $ 5,346 $ (159) $ 10,917 $ (15,019) $ 9,443 $ (2,578) $ 625   $ 11,552 $ (7,529) $ 5,059
Natural Habitat, Inc [Member]                          
Business Acquisition, Percentage of Voting Interests Acquired 80.10%                        
Business Combination, Acquisition Related Costs                         $ 1,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage 19.90%                        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual                   $ 34,500      
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual                   $ 2,200      
Natural Habitat, Inc [Member] | Acquisition-related Costs [Member]                          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total $ 1,000