Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Mar. 01, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
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, Postal Zip Code	L3R 9R2
City Area Code	905
Local Phone Number	479-0654
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	APT
Security Exchange Name	NYSEAMER
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 50,820,442
Entity Common Stock, Shares Outstanding (in shares)		12,263,956
Auditor Firm ID	270
Auditor Name	Tanner LLC
Auditor Location	Lehi, Utah
Auditor Firm ID	270
Entity Central Index Key	0000884269
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false