Note 7 - Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Minimum
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2018
Maximum
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2033
Internal Revenue Service (IRS)
Operating Loss Carryforwards	$ 168,400
Internal Revenue Service (IRS) | Expired
Operating Loss Carryforwards	0	$ 0
Internal Revenue Service (IRS) | 2015 and 2016 Expiration
Operating Loss Carryforwards	800
State and Local Jurisdiction | Expire on Various Dates
Operating Loss Carryforwards	$ 149,700