Note 9 - Contingencies (Details Textual)	Dec. 31, 2021 USD ($)
Indemnity Agreement [Member] \| Maximum [Member]
Debt Instrument, Face Amount	$ 5,000,000
Minnesota Racing Commission Bond [Member]
Debt Instrument, Face Amount	$ 500,000

Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-Name Accounting Standards Codification
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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant