Note 4 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property and equipment	$ 23,815	$ 23,757
Accumulated depreciation and amortization	(21,213)	(20,588)
	2,602	3,169
Machinery and Equipment [Member]
Property and equipment	12,166	12,156
Computers and Other [Member]
Property and equipment	9,614	9,589
Aquifer [Member]
Property and equipment	482	482
Leasehold Improvements [Member]
Property and equipment	$ 1,553	$ 1,530

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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