CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 554,000	$ 605,000
Short-term investments	3,884,000	5,798,000
Investments in marketable equity securities, at fair value	1,226,000	1,620,000
Prepaid expenses and other	384,000	26,000
Total current assets	6,048,000	8,049,000
Mineral properties	16,129,000	15,628,000
Other assets	174,000	124,000
Total assets	22,351,000	23,801,000
Current liabilities:
Accounts payable	215,000	157,000
Paycheck protection loan	0	10,000
Operating lease liability	36,000	7,000
Total current liabilities	251,000	174,000
Long-term liabilities:
Asset retirement obligation - Lik	125,000	125,000
Operating lease liability	46,000	0
Total long-term liabilities	171,000	125,000
Shareholders' equity:
Preferred stock, $0.01 par value, authorized 10,000,000 shares (none issued and outstanding at September 30, 2021 and December 31, 2020)	0	0
Common stock, $0.01 par value, authorized 100,000,000 shares (58,633,766 and 58,108,366 shares, respectively, issued and outstanding at September 30, 2021 and December 31, 2020)	586,000	581,000
Additional paid-in capital	70,833,000	70,514,000
Accumulated deficit	(49,490,000)	(47,593,000)
Total shareholders' equity	21,929,000	23,502,000
Total liabilities and shareholders' equity	$ 22,351,000	$ 23,801,000

No definition available.

Name:	sir_OperatingLeaseLiabilitycurrent
Namespace Prefix:	sir_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).