Note 9 - Income Taxes (Details Textual) - USD ($) $ in Millions		4 Months Ended			12 Months Ended			19 Months Ended	20 Months Ended	24 Months Ended
	Jul. 25, 2011	Oct. 31, 2017	Jun. 30, 2017	Jun. 30, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2013	Feb. 28, 2017	Jun. 30, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						34.00%	34.00%
Operating Loss Carryforwards	$ 90.0	$ 5.0	$ 7.0	$ 4.0		$ 89.0		$ 34.0	$ 35.0	$ 40.0
Operating Loss Carry Forwards, Limitation on Use	$ 4.2	$ 0.8	$ 0.3	$ 1.5				$ 1.4	$ 0.3	$ 1.6
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%