Note 13 - Stock Plans (Detail) - Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Number of Options Outstanding	112,151	127,884
Weighted-Average Remaining Contractual Life (in years)	2 years 6 months
Number of Options Exercisable	68,365
Exercise Price 1 [Member]
Exercise Price (in Dollars per share)	2.85
Number of Options Outstanding	1,250
Weighted-Average Remaining Contractual Life (in years)	4 years 219 days
Exercise Price 2 [Member]
Exercise Price (in Dollars per share)	2.88
Number of Options Outstanding	7,522
Weighted-Average Remaining Contractual Life (in years)	4 years 219 days
Exercise Price 3 [Member]
Exercise Price (in Dollars per share)	4.18
Number of Options Outstanding	3,514
Weighted-Average Remaining Contractual Life (in years)	4 years 219 days
Exercise Price 4 [Member]
Exercise Price (in Dollars per share)	6.91
Number of Options Outstanding	1,764
Weighted-Average Remaining Contractual Life (in years)	4 years 219 days
Exercise Price 5 [Member]
Exercise Price (in Dollars per share)	8.94
Number of Options Outstanding	6,931
Weighted-Average Remaining Contractual Life (in years)	4 years 73 days
Exercise Price 6 [Member]
Exercise Price (in Dollars per share)	9.03
Number of Options Outstanding	4,809
Weighted-Average Remaining Contractual Life (in years)	3 years 146 days
Number of Options Exercisable	1,775
Exercise Price 7 [Member]
Exercise Price (in Dollars per share)	11.19
Number of Options Outstanding	11,489
Weighted-Average Remaining Contractual Life (in years)	1 year 109 days
Number of Options Exercisable	11,489
Exercise Price 8 [Member]
Exercise Price (in Dollars per share)	12.11
Number of Options Outstanding	9,107
Weighted-Average Remaining Contractual Life (in years)	3 years 146 days
Number of Options Exercisable	3,358
Exercise Price 9 [Member]
Exercise Price (in Dollars per share)	12.20
Number of Options Outstanding	6,138
Weighted-Average Remaining Contractual Life (in years)	3 years 146 days
Number of Options Exercisable	2,264
Exercise Price 10 [Member]
Exercise Price (in Dollars per share)	12.21
Number of Options Outstanding	5,765
Weighted-Average Remaining Contractual Life (in years)	2 years 109 days
Number of Options Exercisable	4,056
Exercise Price 11 [Member]
Exercise Price (in Dollars per share)	12.52
Number of Options Outstanding	8,386
Weighted-Average Remaining Contractual Life (in years)	3 years 146 days
Number of Options Exercisable	3,094
Exercise Price 12 [Member]
Exercise Price (in Dollars per share)	13.61
Number of Options Outstanding	3,730
Weighted-Average Remaining Contractual Life (in years)	2 years 109 days
Number of Options Exercisable	2,626
Exercise Price 13 [Member]
Exercise Price (in Dollars per share)	13.88
Number of Options Outstanding	9,034
Weighted-Average Remaining Contractual Life (in years)	1 year 109 days
Number of Options Exercisable	9,034
Exercise Price 14 [Member]
Exercise Price (in Dollars per share)	14.18
Number of Options Outstanding	6,737
Weighted-Average Remaining Contractual Life (in years)	1 year 109 days
Number of Options Exercisable	6,737
Exercise Price 15 [Member]
Exercise Price (in Dollars per share)	14.50
Number of Options Outstanding	8,386
Weighted-Average Remaining Contractual Life (in years)	1 year 109 days
Number of Options Exercisable	8,386
Exercise Price 16 [Member]
Exercise Price (in Dollars per share)	16.49
Number of Options Outstanding	3,297
Weighted-Average Remaining Contractual Life (in years)	2 years 109 days
Number of Options Exercisable	2,318
Exercise Price 17 [Member]
Exercise Price (in Dollars per share)	18.58
Number of Options Outstanding	3,592
Weighted-Average Remaining Contractual Life (in years)	2 years 109 days
Number of Options Exercisable	2,528
Exercise Price 18 [Member]
Exercise Price (in Dollars per share)	22.54
Number of Options Outstanding	10,200
Weighted-Average Remaining Contractual Life (in years)	292 days
Number of Options Exercisable	10,200
Exercise Price 19 [Member]
Exercise Price (in Dollars per share)	30.22
Number of Options Outstanding	500
Weighted-Average Remaining Contractual Life (in years)	36 days
Number of Options Exercisable	500