Note 11 - Commitments and Contingencies - Redeemable Non-controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Beginning balance			$ 16,112
Net income attributable to noncontrolling interest	$ (265)	$ (137)	(801)	$ 269
Ending balance	9,970		9,970
Natural Habitat, Inc [Member]
Beginning balance	16,476	6,908	16,112	6,502
Net income attributable to noncontrolling interest	(265)	(137)	(801)	269
Fair value adjustment of put option	(6,241)	0	(5,341)	0
Ending balance	$ 9,970	$ 6,771	$ 9,970	$ 6,771