Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 02, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-15725
Entity Registrant Name	Alpha Pro Tech, Ltd.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	63-1009183
Entity Address, Address Line One	60 Centurian Drive, Suite 112
Entity Address, City or Town	Markham
Entity Address, State or Province	ON
Entity Address, Country	CA
Entity Address, Postal Zip Code	L3R 9R2
City Area Code	905
Local Phone Number	479-0654
Title of 12(b) Security	$0.01 par value
Trading Symbol	APT
Security Exchange Name	NYSEAMER
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
Entity Common Stock, Shares Outstanding (in shares)		12,188,206
Entity Central Index Key	0000884269
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false