The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 04, 2016	Jul. 31, 2015
Finite-Lived Intangible Assets, Gross, Total	$ 12,729	$ 12,729
Goodwill, Ending Balance	22,105	22,105
Amortization of Intangible Assets, Total	1,600	1,600	$ 1,600
Trade Names [Member]
Finite-Lived Intangible Assets, Gross, Total	2,900	2,900
Customer Lists [Member]
Finite-Lived Intangible Assets, Gross, Total	3,300	3,300
Operating Rights [Member]
Finite-Lived Intangible Assets, Gross, Total	$ 6,529	$ 6,529			$ 6,500
Natural Habitat, Inc [Member]
Goodwill, Ending Balance				$ 22,100
Natural Habitat, Inc [Member] \| Trade Names [Member]
Finite-Lived Intangible Assets, Gross, Total				2,900
Natural Habitat, Inc [Member] \| Customer Lists [Member]
Finite-Lived Intangible Assets, Gross, Total				$ 3,300