K. Income Taxes (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Windfall tax benefits unrecognized	$ 900
Valuation allowance increase (decrease)	2,100	$ (1,500)
Net operating loss carryforward	$ 50,300
Loss carryforward expiration date	Dec. 31, 2032
Research and development tax credits	$ 1,500
Research and development tax credit expiration date	Dec. 31, 2035
Federal income tax rate	34.00%
China income tax rate	25.00%
Unrecognized tax benefits	$ 1,797	$ 1,659	$ 2,200	$ 0
China [Member]
Net operating loss carryforward	$ 6,200
Loss carryforward expiration date	Dec. 31, 2020
Taiwan
Net operating loss carryforward	$ 2,600
Loss carryforward expiration date	Dec. 31, 2025