Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Basis difference – investments		$ 8,015
Federal NOL carryforwards	153,139	145,608
State NOL carryforwards	9,016	8,301
Other	1,866	2,756
Gross deferred tax asset	164,021	164,680
Valuation allowance	(163,992)	(162,708)
Deferred tax asset	30	1,972
Deferred tax liabilities:
Other	30	1,972
Deferred tax liability	30	1,972
Net deferred tax asset