Note 8 - Common Stock (Details) - Options Granted Under the Plans (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding at 12/31/13 (in Shares)	2,187
Weighted- Average Remaining Contractual Life (years)	7 years 343 days
Weighted Average Exercise Price	$ 4.11	$ 4.06	$ 4.21	$ 5.00
Number Exercisable at 12/31/13 (in Shares)	601
Weighted Average Exercise Price, Exercisable	$ 4.76
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower	$ 1.36
Range of Exercise Prices, Upper	$ 4.18
Number Outstanding at 12/31/13 (in Shares)	1,015
Weighted- Average Remaining Contractual Life (years)	7 years 350 days
Weighted Average Exercise Price	$ 2.45
Number Exercisable at 12/31/13 (in Shares)	319
Weighted Average Exercise Price, Exercisable	$ 1.84
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower	$ 4.19
Range of Exercise Prices, Upper	$ 8.35
Number Outstanding at 12/31/13 (in Shares)	1,027
Weighted- Average Remaining Contractual Life (years)	9 years 3 days
Weighted Average Exercise Price	$ 4.79
Number Exercisable at 12/31/13 (in Shares)	137
Weighted Average Exercise Price, Exercisable	$ 5.10
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower	$ 8.36
Range of Exercise Prices, Upper	$ 11.45
Number Outstanding at 12/31/13 (in Shares)	145
Weighted- Average Remaining Contractual Life (years)	83 days
Weighted Average Exercise Price	$ 10.89
Number Exercisable at 12/31/13 (in Shares)	145
Weighted Average Exercise Price, Exercisable	$ 10.89