Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Dec. 04, 2020
Document Information [Line Items]
Entity Registrant Name	Yellowstone Acquisition Co
Entity Central Index Key	0001823587
Trading Symbol	ysac
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one redeemable warrant
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		3,399,724
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		13,598,898