Note 4 - Accounting for Stock-based Compensation - Equity Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Cost of Sales [Member]
Allocated share-based compensation expense	$ 1	$ 1	$ 5	$ 4
Selling and Marketing Expense [Member]
Allocated share-based compensation expense	1	2	3	8
Research and Development Expense [Member]
Allocated share-based compensation expense	5	3	13	14
General and Administrative Expense [Member]
Allocated share-based compensation expense	35	38	108	155
Allocated share-based compensation expense	$ 42	$ 44	$ 129	$ 181