Note J - Commitments (Details Textual) $ in Millions	12 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Nov. 05, 2018 ft²
Operating Leases, Rent Expense, Net, Total | $	$ 3.2	$ 3.1
California 1 [Member]
Operating Lease Facility Area (Square Foot)	162,000
SWITZERLAND | Natural Alternatives International Europe SA [Member]
Operating Lease Facility Area (Square Foot)	125,000
Lessee, Operating Lease, Term of Contract (Year)	5 years
SWITZERLAND | Natural Alternatives International Europe SA [Member] | Sofinol SA [Member]
Operating Lease Facility Area (Square Foot)			2,870
Lessee, Operating Lease, Term of Contract (Year)			5 years