Note 12 - Commitments and Contingencies (Details Textual) - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense		$ 1,047,000	$ 1,031,000
Pending Litigation [Member] | Alpha Pro Tech, Inc. v. VWR International, LLC [Member]
Loss Contingency, Damages Sought, Value	$ 2,000,000