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Business and Summary of Significan Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Jul. 12, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Common stock issued at .3572 shares for 1 share Zazu					19,788,177
Replacement options issued to Zazu					1,782,428
Total purchase price Zazu Acquisition				$ 16,110
Stock issuance costs related to Zazu				$ 117
Cash and equivalents not covered under FDIC			$ 113
United States Treasuries			9,345
Certificates of Deposit			500
US dollar savings account in Peru			$ 378
Potentially dilutive shares consisting of stock options			5,223,160	1,982,428
Cumulative effect adjustment for change in accounting principle		$ 576
Unrealized loss on marketable equity securities			$ 1,058
Asset and offsetting liability upon adoption of ASU 2016-02	$ 80

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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