Note 3 - Discontinued Operations - Summary of Discontinued Operations (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
LCD Monitor [Member]
Net sales		$ 0	$ 14,498,000	$ 29,688,000
Earnings (loss) from discontinued operations	[1]	88,000	(916,000)	1,442,000
Loss on sale of assets		0	(2,145,000)	0
Discontinued operations, net of $0 income taxes		88,000	(3,061,000)	1,442,000
Earnings (loss) from discontinued operations		88,000	(916,000)	1,442,000
Loss on sale of assets		0	(2,145,000)	0
Discontinued operations, net of $0 income taxes		$ 88,000	$ (3,061,000)	$ 1,442,000

[1] Including transaction costs