Note 7 - Investment in Closely Held Company (Details Textual) - USD ($)		3 Months Ended
	Feb. 07, 2019	Mar. 31, 2019	Mar. 31, 2018
Gain (Loss) on Sale of Closely Held Stock		$ 120,000
Churchill Downs Holdings, Ltd. [Member]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount		$ 168,000
Sale of Closely Held Stock, Shares	2,500
Gain (Loss) on Sale of Closely Held Stock	$ 120,000