Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) (USD $)	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Net sales	$ 18,618,000us-gaap_SalesRevenueNet	$ 16,475,000us-gaap_SalesRevenueNet	$ 37,313,000us-gaap_SalesRevenueNet	$ 33,630,000us-gaap_SalesRevenueNet
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Net sales	14,302,000	10,325,000	24,663,000	21,207,000
% of total net sales	85.00%	69.00%	72.00%	71.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 1 [Member]
Net sales	8,951,000	5,229,000	15,948,000	10,509,000
% of total net sales	54.00%	35.00%	47.00%	35.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Net sales	1,683,000	2,026,000	4,591,000	5,660,000
% of total net sales	10.00%	14.00%	13.00%	19.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 3 [Member]
Net sales	1,915,000	3,070,000	4,124,000	5,038,000
% of total net sales	11.00%	20.00%	12.00%	17.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 4 [Member]
Net sales	$ 1,753,000
% of total net sales	10.00%