Note 5 - Investment in Closely Held Company (Details Textual) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 168,000
Churchill Downs Holdings, Ltd. [Member]
Ownership Percentage	5.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 168,000

Amount of investment in equity method investee and investment in and advance to affiliate.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant