Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Document Information [Line Items]
Entity Central Index Key	0000047307
Entity Registrant Name	CRAWFORD UNITED Corp
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-000147
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-0288470
Entity Address, Address Line One	10514 Dupont Avenue, Suite 200
Entity Address, City or Town	Cleveland
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44108
City Area Code	216
Local Phone Number	243-2614
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		731,848
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,677,058