Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%	34.00%	34.00%
Income Tax Expense (Benefit)		$ (11,672)	$ 1,844	$ (133)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		(6,600)
Income Tax Expense (Benefit), Use of Naked Credit as a Source of Income to Release a Portion of Valuation Allowance		(4,800)
Income Tax Expense (Benefit), Refundable AMT Credit		$ (200)
Effective Income Tax Rate Reconciliation, Percent		18.60%	14.70%	0.30%
Deferred Tax Liabilities, Net		$ 1,575	$ 13,010
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		0	0	$ 0
Tax Credit Carryforward, Amount		34,200
Liability for Uncertainty in Income Taxes		0	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		(3,700)
Operating Loss Carryforwards		664,800
State and Local Jurisdiction [Member]
Operating Loss Carryforwards		$ 569,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%