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Note 8 - Subsequent Events (Details Textual) - USD ($)	Dec. 01, 2020	Nov. 16, 2020	Oct. 26, 2020	Oct. 21, 2020	Sep. 30, 2020
Common Class B [Member]
Common Stock, Shares, Outstanding, Ending Balance (in shares)					3,593,750
Subsequent Event [Member] \| Private Placement Warrant [Member]
Class of Warrant or Right, Issued During Period, Purchase Price (in dollars per share)	$ 1		$ 1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	219,779
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 11.50		$ 11.50
Subsequent Event [Member] \| Common Class B [Member]
Share Price (in dollars per share)	$ 0.00735			$ 0.007
Subsequent Event [Member] \| BOC Yellowstone LLC [Member] \| BOC Yellowstone II LLC [Member]
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates, Total		$ 309,375
Subsequent Event [Member] \| BOC Yellowstone LLC [Member] \| BOC Yellowstone II LLC [Member] \| Class B Common Stock of Yellowstone Acquisition Company [Member]
Investment Owned, Shares Transferred (in shares)		206,250
Subsequent Event [Member] \| BOC Yellowstone II LLC [Member] \| Class B Common Stock of Yellowstone Acquisition Company [Member]
Investment Owned, Shares to Be Transferred Upon Initial Business Combination (in shares)		206,250
Subsequent Event [Member] \| BOC Yellowstone LLC [Member]
Repayments of Notes Payable			$ 150,000
Subsequent Event [Member] \| BOC Yellowstone LLC [Member] \| Common Class B [Member]
Common Stock, Shares, Outstanding, Ending Balance (in shares)	3,399,724			3,593,750