Note 11 - Business Segment Information (Detail) - Summary of Business Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net revenue
Net Revenue	$ 27,621	$ 44,019
Operating income (loss)
Operating Income	549	3,363
Unallocated general and administrative expenses	(1,790)	(1,953)
Interest, net	15	(11)
Gain on sale of assets	2	918
Equity in income (loss) of joint venture	(106)	91
Other expense, net	248	160
Income before income taxes	706	3,603
Theatre [Member] | Product [Member]
Net revenue
Net Revenue	24,136	39,652
Operating income (loss)
Operating Income	2,237	3,824
Theatre [Member] | Services [Member]
Net revenue
Net Revenue	2,543	3,665
Operating income (loss)
Operating Income	148	591
Theatre [Member]
Net revenue
Net Revenue	26,679	43,317
Operating income (loss)
Operating Income	2,385	4,415
Lighting [Member]
Net revenue
Net Revenue	942	702
Operating income (loss)
Operating Income	(48)	(17)
Operating Segments [Member]
Net revenue
Net Revenue	27,621	44,019
Operating income (loss)
Operating Income	$ 2,337	$ 4,398