Note 9 - Income Taxes (Details) - Approximate Amount Of Unused Operating Loss Carry Forwards and Expiration Dates - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 01, 2015	Jun. 03, 2013	Feb. 05, 2013	Jul. 25, 2011
Operating Loss Carryforwards [Line Items]
$	$ 181,158	$ 31,000	$ 34,000	$ 34,000	$ 90,000
Expires 2022 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	4,843
Expires 2023 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	2,293
Expires 2024 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	15,647
Expires 2025 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	8,168
Expires 2026 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	7,361
Expires 2028 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	11,905
Expires 2029 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	18,547
Expires 2030 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	18,145
Expires 2031 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	21,386
Expires 2032 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	20,558
Expires 2033 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	10,321
Expires 2034 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	22,906
Expires 2035 [Member]
Operating Loss Carryforwards [Line Items]
Amount of unused operating loss carry forwards	$ 19,078