8. Long-Term Debt (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Total debt	$ 1,786,114	$ 1,863,915
Less current portion	(546,988)	(391,046)
Noncurrent portion	1,239,126	1,472,869
First Security Bank [Member]
Total debt	8,054	18,245
Catepillar Finance [Member]
Total debt	27,096	40,556
Catepillar Finance [Member]
Total debt	40,278	0
Wells Fargo Bank [Member]
Total debt	0	473
De Lage Landen Financial Services [Member]
Total debt	13,344	20,581
De Lage Landen Financial Services [Member]
Total debt	15,776	22,944
PhyllisRice [Member]
Total debt	14,146	14,146
SoyatalMine [Member]
Total debt	715,709	776,319
Guadalupe Mine [Member]
Total debt	$ 951,711	$ 970,651

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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