Note 10 - Segment Disclosures - Segment Information on Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 107,888	$ 75,963
Depreciation and amortization (Note 2)	13,524	13,090
Segment operating income (loss)	14,307	(277)
Capital expenditures	5,117	11,291
Motorsports Event Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	102,658	71,393
Depreciation and amortization (Note 2)	13,469	13,053
Segment operating income (loss)	13,565	(961)
Capital expenditures	5,086	11,111
Other Segments [Member]
Revenue from Contract with Customer, Including Assessed Tax	5,230	4,570
Depreciation and amortization (Note 2)	55	37
Segment operating income (loss)	742	684
Capital expenditures	$ 31	$ 180

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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