Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%					35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability					$ (16,000,000)
Income Tax Expense (Benefit), Continuing Operations, Revaluation Differences in Deferred Taxes					(20,000,000)
Income Tax Expense (Benefit), Total	$ (710,000)	$ (1,465,000)			(17,660,000)	$ (6,015,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total					$ (4,125,000)	$ (5,858,000)
Liability For Uncertain Tax Positions, Reversal				$ 2,665,000
Unrecognized Tax Benefits, Accumulated Reduction				743,000
Deferred Tax Liability, Reversal				$ 352,000
Effective Income Tax Rate Reconciliation, Percent, Total					428.00%	103.00%
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year					2015
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year					2013
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent							24.28%