Note 4 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property and equipment	$ 606	$ 10,942
Accumulated depreciation and amortization	(44)	(9,825)
	562	1,117
Machinery and Equipment [Member]
Property and equipment	36	1,367
Computers and Other [Member]
Property and equipment	88	7,540
Aquifer [Member]
Property and equipment	482	482
Leasehold Improvements [Member]
Property and equipment		$ 1,553

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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