Business and Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents are held in brokerage accounts and foreign bank	$ 516
Mineral property revenue recorded for royalty sale	408
Fair value of cash received for royalty sale	185
Fair value of note received for royalty sale less carrying value of $40,000	263
Fair value of note	262
Charge to exchange gain/loss for royalty sale	1
Assets in United States Treasuries	$ 9,277
Potentially dilutive shares related to outstanding common stock options	4,373,000	2,082,428
Operating lease asset Wheat Ridge office	$ 82
Operating lease liability Wheat Ridge office	$ 82

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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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Represents gains or losses resulting from transactions conducted in foreign currencies.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The increase (decrease) during the reporting period of the amounts due from borrowers for outstanding secured or unsecured loans evidenced by a note.

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Amount of interest-bearing money market demand account deposit liabilities in foreign banking offices.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For 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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