Note 5 - Equipment, Net - Summary of Property, Plant, and Equipment (Details) - USD ($)	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Property, Plant, and Equipment, Gross	$ 8,006,000	$ 7,159,000	$ 7,410,000
Less accumulated depreciation and amortization	(5,010,000)	(4,829,000)	(4,448,000)
Property, Plant, and Equipment, Net	2,996,000	2,330,000	2,962,000
Machinery and Equipment [Member]
Property, Plant, and Equipment, Gross	$ 6,507,000	5,772,000	6,604,000
Machinery and Equipment [Member] | Minimum [Member]
Estimated Useful Life (Year)	2 years 182 days
Machinery and Equipment [Member] | Maximum [Member]
Estimated Useful Life (Year)	10 years
Computer and Software [Member]
Property, Plant, and Equipment, Gross	$ 718,000	733,000	397,000
Computer and Software [Member] | Minimum [Member]
Estimated Useful Life (Year)	2 years
Computer and Software [Member] | Maximum [Member]
Estimated Useful Life (Year)	5 years
Office Equipment [Member]
Property, Plant, and Equipment, Gross	$ 253,000	427,000	260,000
Office Equipment [Member] | Minimum [Member]
Estimated Useful Life (Year)	5 years
Office Equipment [Member] | Maximum [Member]
Estimated Useful Life (Year)	10 years
Leasehold Improvements [Member]
Property, Plant, and Equipment, Gross	$ 528,000	$ 227,000	$ 149,000
Leasehold Improvements, Estimated Useful Life	Shorter of 5 years or remaining lease term