Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		9 Months Ended		15 Months Ended
	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Number of Revenue Sources	5		5		5
Cash, Uninsured Amount	$ 5,080,127		$ 5,080,127		$ 5,080,127	$ 4,615,000
Depreciation	1,882,000	$ 1,728,000
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	0		0		0
Goodwill	30,538,000		30,538,000		30,538,000	58,538,000
Goodwill, Impairment Loss	28,000,000		28,000,000
Research and Development Expense	$ 1,562,000				1,401,000
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares	286,000	914,000
Income Tax Expense (Benefit)	$ (9,588,000)	$ 251,000
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)	(81,010)
Lighting Segment [Member]
Goodwill	29,373,000		$ 29,373,000		$ 29,373,000	$ 57,373,000
Goodwill, Impairment Loss	$ 28,000,000
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