Note 2 - Significant Accounting Policies and Other Disclosures (Details Textual)	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Effective Income Tax Rate Reconciliation, Percent	37.10%		33.10%	35.00%	35.80%
Increase (Decrease) in Deferred Income Tax Liabilities for Anticipated Change in State Income Tax Rates				$ (1,791,000)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 515,000			515,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 507,000		$ 507,000
Income Taxes Paid				12,855,000	650,000
Unrecognized Tax Benefits	12,006,000			12,006,000		$ 12,006,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	260,000			260,000		260,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	216,000			216,000		140,000
Excise and Sales Taxes	1,386,000		3,610,000	4,115,000	6,427,000
Advertising Expense	3,831,000		5,724,000	10,854,000	13,306,000
Deferred Advertising Costs	0			0		0
Accelerated Depreciation and Removal Costs, Before Tax		$ 4,597,000
Income Tax Expense (Benefit), Accelerated Depreciation and Removal Costs		$ (1,700,000)
TMS Property [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	403,000			855,000
Texas Motor Speedway Inc. [Member]
Depreciation			357,000		357,000
Atlanta Motor Speedway Property [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			1,519,000		1,519,000
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits	11,794,000			11,794,000		11,794,000
Deferred Tax Liabilities [Member]
Unrecognized Tax Benefits	212,000			212,000		212,000
Discontinued Operations [Member]
Unrecognized Tax Benefits	11,746,000			11,746,000
Texas Motor Speedway Inc. [Member]
Royalty Revenue	508,000		$ 615,000	$ 1,486,000	$ 1,666,000
Royalty Revenue, Distribution, Percentage				25.00%
Texas Motor Speedway Inc. [Member] | Royalty Arrangement [Member]
Deferred Revenue	$ 0			$ 0		0
Texas Motor Speedway Inc. [Member] | Indy Car Series [Member]
Deferred Revenue						$ 524,000
Charlotte Motor Speedway LLC [Member]
Number of Seats Removed		7,000
Kentucky Speedway [Member]
Number of Seats Removed		17,000
New Hampshire Motor Speedway, Inc. [Member]
Number of Seats Removed		12,000