CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 244,000	$ 462,000
Short-term investments	4,898,000	5,087,000
Investments in marketable equity securities, at fair value	953,000	1,307,000
Prepaid expenses and other	37,000	303,000
Total current assets	6,132,000	7,159,000
Mineral properties	16,692,000	16,306,000
Other assets	149,000	154,000
Total assets	22,973,000	23,619,000
Current liabilities:
Accounts payable	567,000	239,000
Operating lease liability	42,000	37,000
Total current liabilities	609,000	276,000
Long-term liabilities
Asset retirement obligation - Lik	125,000	125,000
Operating lease liability	4,000	35,000
Total long-term liabilities	129,000	160,000
Shareholders' equity:
Preferred stock, $0.01 par value, authorized 10,000,000 shares (none issued and outstanding at September 30, 2022 and December 31, 2021)	0	0
Common stock, $0.01 par value, authorized 100,000,000 shares (64,768,873 and 62,036,399 shares, respectively, issued and outstanding at September 30, 2022 and December 31, 2021)	648,000	620,000
Additional paid-in capital	74,809,000	72,523,000
Accumulated deficit	(53,222,000)	(49,960,000)
Total shareholders' equity	22,235,000	23,183,000
Total liabilities and shareholders' equity	$ 22,973,000	$ 23,619,000

No definition available.

Name:	sodi_InvestmentsInMarketableEquitySecuritiesAtFairValue
Namespace Prefix:	sodi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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).