Note 6 - Share Option and Equity Incentive Plans - Expense Recognized During the Year Related to Share-based Compensation Transactions (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allocated Share-based Compensation Expense	$ 875,000	$ 265,000
Cost of Sales [Member]
Allocated Share-based Compensation Expense	117,000	11,000
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	54,000	6,000
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	317,000	89,000
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	$ 387,000	$ 159,000