Note 11 - Cooperative Marketing Agreement - Purse Enhancement and Marketing Payments (Details)	Dec. 31, 2020 USD ($)
2021, purse enhancement payments to horsemen	$ 5,620,000
2022, purse enhancement payments to horsemen	7,380,000
SMSC [Member] | Purse Enhancement Payments To Horsemen [Member]
2021, purse enhancement payments to horsemen	7,380,000	[1]
2022, purse enhancement payments to horsemen	7,380,000	[1]
SMSC [Member] | Marketing Payments To Canterbury Park [Member]
2021, marketing payments to Canterbury Park	1,620,000
2022, marketing payments to Canterbury Park	$ 1,620,000

[1] Includes $100,000 each year payable to various horsemen associations