Note 6 - Common Stock and Stock Options (Detail) - Summary of option activity: (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Outstanding - beginning of year	2,602
Outstanding - beginning of year (in Dollars per share)	$ 27.09
Granted	461
Granted (in Dollars per share)	$ 4.98
Exercised	(87)
Exercised (in Dollars per share)	$ 2.16
Forfeited or expired	(877)
Forfeited or expired (in Dollars per share)	$ 26.77
Outstanding - end of year	2,099
Outstanding - end of year (in Dollars per share)	$ 23.40
Outstanding - end of year	5 years 6 months	[1]
Outstanding - end of year (in Dollars)	$ 580
Outstanding - end of year less estimated forfeitures	2,059
Outstanding - end of year less estimated forfeitures (in Dollars per share)	$ 23.71
Outstanding - end of year less estimated forfeitures	5 years 146 days	[1]
Outstanding - end of year less estimated forfeitures (in Dollars)	580
Exercisable - end of year	1,724
Exercisable - end of year (in Dollars per share)	$ 27.27
Exercisable - end of year	4 years 292 days	[1]
Exercisable - end of year (in Dollars)	$ 580
Outstanding - beginning of year	2,099
Outstanding - beginning of year (in Dollars per share)	$ 23.40

[1] Excludes 400 options which are exercisable during the lifetime of the optionee and 17,400 options which are exercisable during the continued employment of the optionee and for a three-year period thereafter.