Note 5 - Related Party Transactions (Details Textual)					1 Months Ended
		Oct. 21, 2020 $ / shares shares	Oct. 09, 2020 shares	Aug. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 01, 2020 $ / shares shares
Stock Issued During Period, Value, New Issues | $	[1]				$ 25,000
BOC Yellowstone LLC [Member]
Related Party, Working Capital Loan, Conversion, Price Per Warrant (in dollars per share) | $ / shares					$ 1.50
BOC Yellowstone LLC [Member] | Subsequent Event [Member]
Common Stock, Shares Surrendered (in shares)		718,750	1,437,500
Common Class B [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.0001
Common Stock, Shares, Outstanding, Ending Balance (in shares)					3,593,750
Common Stock, Conversion Rate					1
Common Class B [Member] | Subsequent Event [Member]
Common Stock, Shares Surrendered (in shares)		718,750	1,437,500
Share Price (in dollars per share) | $ / shares		$ 0.007				$ 0.00735
Common Class B [Member] | BOC Yellowstone LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)				5,750,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.0001
Stock Issued During Period, Value, New Issues | $				$ 25,000
Common Stock, Conversion Rate					1
Common Stock Forfeited if Over-Allotment Option is Not Exercised (in shares)					468,750
Percentage of Issued And Outstanding Shares					20.00%
Common Class B [Member] | BOC Yellowstone LLC [Member] | Subsequent Event [Member]
Common Stock, Shares, Outstanding, Ending Balance (in shares)		3,593,750				3,399,724

[1] The shares and associated amounts reflect a surrender of 1,437,500 and 718,750 shares of Class B Common Stock by the Sponsor, effected on October 9, 2020 and October 21, 2020, respectively (see Note 5).