Note 21 - Income Taxes - Statutory Income Tax to Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal benefit/(provision) at statutory tax rate* (1) (3)	[1],[2],[3]	$ 3,010	$ (2,490)	$ (520)
State and local provision, net of federal benefit (2)	[4]	(42)	(386)	(1,072)
Total tax benefit/(provision) – U.S.		$ 2,968	$ (2,876)	$ (1,592)

[1] Federal statutory tax rate of 21% for the years ended December 31, 2019 and 2018 and federal statutory tax rate of 35% for the years ended December 31, 2017.

[2] The year ended December 31, 2018 includes a charge of $1.6 million related to the recording of a deferred tax valuation allowance.

[3] The year ended December 31, 2019 includes a tax benefit from AMT Credit refunds of $3.7 million and $3.1 million related to the recording of a deferred tax valuation allowance.

[4] The year ended December 31, 2018 includes a charge of $0.3 million related to the recording of a deferred tax valuation allowance.