Note 10 - Stock Incentive Plans Activity - Stock Options (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Balance, shares subject to options (in shares)	6,834
Balance, weighted average exercise price (in dollars per share)	$ 6.79
Balance, aggregate intrinsic value	$ 0.5
Balance, weighted average remaining contractual term		292 days
Expired (in shares)	(2,000)
Expired (in dollars per share)	$ 3.23
Exercised (in shares)	(4,834)
Exercised (in dollars per share)	$ 8.27
Balance, shares subject to options (in shares)		6,834
Balance, weighted average exercise price (in dollars per share)		$ 6.79
Balance, aggregate intrinsic value		$ 0.5
Exercisable, December 31, 2015 (in shares)
Exercisable, December 31, 2015 (in dollars per share)
Exercisable, December 31, 2015