Note E - Debt (Details Textual)		3 Months Ended
	Dec. 22, 2014 USD ($)	Sep. 30, 2015 CHF (SFr)	Sep. 30, 2015 USD ($)	Feb. 19, 2007 CHF (SFr)	Feb. 19, 2007 USD ($)	Sep. 22, 2006 CHF (SFr)	Sep. 22, 2006 USD ($)
Wells Fargo Bank, N.A. [Member] | Maximum [Member]
Ratio of Indebtedness to Net Capital			1.25
Wells Fargo Bank, N.A. [Member] | Minimum [Member]
Line of Credit Covenant Number of Consecutive Days That Outstanding Balance Must Be Zero		30 days	30 days
Wells Fargo Bank, N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.75%	1.75%
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing			1.75%
Wells Fargo Bank, N.A. [Member]
Long-term Line of Credit			$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000,000
Line of Credit Facility, Commitment Fee Amount	$ 10,000
Net Income Required in Future for Income Covenant			750,000
Long-term Debt, Percentage Bearing Variable Interest, Amount			100,000
Line of Credit Facility Outstanding Daily Balance During Period			0
Minimum Prepayment Amount Under Line of Credit			$ 100,000
Natural Alternatives International Europe SA [Member] | Fixed Loans [Member]
Debt Prepayment Penalty Rate		0.10%	0.10%
Debt Pre Payment Penalty		SFr 1,000	$ 1,028
Natural Alternatives International Europe SA [Member]
Long-term Line of Credit			$ 0
Line of Credit Facility, Maximum Borrowing Capacity						SFr 1,300,000	$ 1,300,000
Line of Credit Facility Maximum Borrowing Capacity Annual Reduction						SFr 160,000	$ 165,000
Line of Credit Facility Maximum Amount Outstanding after Reduction				SFr 500,000	$ 514,000
Debt Instrument, Term		2 years	2 years
Debt Instrument, Interest Rate, Stated Percentage			5.00%
Line of Credit Facility, Current Borrowing Capacity			$ 5,500,000