Note 1 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended	12 Months Ended
	Mar. 02, 2018 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Number of Reportable Segments			1
Inventory, Gross			$ 23,200,000	$ 23,000,000
Inventory Valuation Reserves			2,500,000	1,300,000
Impairment of Long-Lived Assets Held-for-use			0
Capitalized Computer Software, Net			2,100,000	2,400,000
Life Insurance Policy, Number Held					27
Cash Surrender Value of Life Insurance					$ 22,300,000
Proceeds from Life Insurance Policy		$ 28,100,000		28,139,000
Payments for (Proceeds from) Life Insurance Policies				$ (22,400,000)
Accounting Standards Update 2017-07 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			340,000
Borrowings Against Cash [Member]
Secured Debt			$ 5,500,000
Subsequent Event [Member] | Revolving Credit Facility [Member] | Wells Fargo [Member]
Repayments of Lines of Credit	$ 1,300,000
Asset Sale [Member] | Churchill Downs LLC [Member] | Subsequent Event [Member]
Disposal Group, Including Discontinued Operation, Consideration	10,800,000
Disposal Group, Including Discontinued Operation, Note Receivable, Amount	$ 7,400,000
Disposal Group, Including Discontinued Operation, Equity Interest in Buyer	5.00%