Note 11 - Concentrations - Sales to Customers (Details) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue, Net	$ 6,013,000	$ 7,772,000	$ 14,525,000	$ 11,929,000
Geographic Concentration Risk [Member] | CHINA
Revenue, Net	2,176,000		3,296,000	2,797,000
Geographic Concentration Risk [Member] | UNITED STATES
Revenue, Net	1,970,000		6,675,000	5,122,000
Geographic Concentration Risk [Member] | Asia - Other [Member]
Revenue, Net	983,000		1,951,000	1,955,000
Geographic Concentration Risk [Member] | Europe [Member]
Revenue, Net	721,000		1,739,000	1,343,000
Geographic Concentration Risk [Member] | All Other Countries [Member]
Revenue, Net	$ 163,000		$ 864,000	$ 712,000