Note 9 - Common Stock (Detail) - Options Granted Under the Plans (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Number Outstanding at 12/31/11 (in Shares)	2,053,000	1,332,000	1,470,000	1,450,000
Weighted- Average Remaining Contractual Life (years)	7 years 211 days
Weighted Average Exercise Price	$ 4.06	$ 4.21	$ 5.00	$ 8.16
Number Exercisable at 12/31/11 (in Shares)	544,000
Weighted Average Exercise Price, Exercisable	$ 5.75
Range 1 [Member]
Range of Exercise Prices, Lower	$ 1.36
Range of Exercise Prices, Upper	$ 4.18
Number Outstanding at 12/31/11 (in Shares)	1,135,000
Weighted- Average Remaining Contractual Life (years)	8 years 321 days
Weighted Average Exercise Price	$ 2.45
Number Exercisable at 12/31/11 (in Shares)	189,000
Weighted Average Exercise Price, Exercisable	$ 1.71
Range 2 [Member]
Range of Exercise Prices, Lower	$ 4.19
Range of Exercise Prices, Upper	$ 8.35
Number Outstanding at 12/31/11 (in Shares)	773,000
Weighted- Average Remaining Contractual Life (years)	6 years 317 days
Weighted Average Exercise Price	$ 5.15
Number Exercisable at 12/31/11 (in Shares)	210,000
Weighted Average Exercise Price, Exercisable	$ 5.83
Range 3 [Member]
Range of Exercise Prices, Lower	$ 8.36
Range of Exercise Prices, Upper	$ 11.45
Number Outstanding at 12/31/11 (in Shares)	145,000
Weighted- Average Remaining Contractual Life (years)	1 year 83 days
Weighted Average Exercise Price	$ 10.89
Number Exercisable at 12/31/11 (in Shares)	145,000
Weighted Average Exercise Price, Exercisable	$ 10.89