Note 7 - Sales to Customers (Details) - USD ($)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Geographic Concentration Risk [Member] | UNITED STATES
Sales to Customers	$ 8,428,000	$ 6,909,000
Geographic Concentration Risk [Member] | CHINA
Sales to Customers	2,500,000	3,169,000
Geographic Concentration Risk [Member] | Asia - Other [Member]
Sales to Customers	1,955,000	1,864,000
Geographic Concentration Risk [Member] | Europe [Member]
Sales to Customers	2,147,000	3,072,000
Geographic Concentration Risk [Member] | South America [Member]
Sales to Customers	730,000	771,000
Geographic Concentration Risk [Member] | All Other Countries [Member]
Sales to Customers	282,000	202,000
Sales to Customers	$ 16,042,000	$ 15,987,000