Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 163,992	$ 162,708
Operating Loss Carryforwards, Total	729,200
Operating Loss Carryforwards, Mortgage Securities	250,300
Operating Loss Carryforwards with No Expiration	94,600
Unrecognized Tax Benefits, Ending Balance	11	328	$ 331
Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations, Due In Next Twelve Months	100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 100	$ 100
Open Tax Year	2015 2016 2017 2018
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2025
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2018
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date		Dec. 31, 2037