Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		6 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Jun. 30, 2016 USD ($)
Number of Revenue Sources	5		5
Cash, FDIC Insured Amount	$ 250,000		$ 250,000
Cash, Uninsured Amount	35,995,000		35,995,000		$ 37,883,000
Depreciation	1,669,000	$ 1,471,000	3,397,000	$ 2,921,000
Research and Development Expense	$ 1,269,000	$ 1,320,000	$ 2,670,000	$ 2,631,000
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares	787,000	987,000	852,000	836,000
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 0		$ 0
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	0		0
Lighting Segment [Member]
Assets Held-for-sale, Not Part of Disposal Group	1,713,000		1,713,000
Graphics Segment [Member]
Assets Held-for-sale, Not Part of Disposal Group	$ 1,463,000		$ 1,463,000
Minimum [Member]
Media Content Service Period			30 days
Finite-Lived Intangible Asset, Useful Life			7 years
Standard Warranty Term			1 year
Maximum [Member]
Media Content Service Period			1 year
Finite-Lived Intangible Asset, Useful Life			20 years
Standard Warranty Term			5 years
Maximum [Member] | Product Warranty Exceptions [Member]
Standard Warranty Term			10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life			15 years