Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]: Cash and Cash Equivalents, Policy (Policies)	12 Months Ended
Dec. 31, 2018
Policies
Cash and Cash Equivalents, Policy	Cash equivalents are carried at cost which approximates fair value, and include principally interest-bearing deposits at brokers, money market instruments and U.S. Treasury securities with original maturities of less than 91 days. Investments with original maturities of 91 days to one year are considered short-term investments and are carried at cost, which approximates fair value.

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-SubTopic 10
-Section 05
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6375392&loc=d3e26790-107797

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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