Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Operating Loss Carryforwards, Total			$ 244,194,000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 2,754,909	$ 27,500,720
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			27.55%	34.00%
Deferred Tax Assets, Increase (Decrease)	$ (21,000,000)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 6,031,702
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	4,000,000
Valuation Allowance Related to Deferred Tax Assets Remeasurement [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (17,000,000)
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total			$ 164,160,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Net Operating Loss Carryforwards, Expiration Year			2019
Domestic Tax Authority [Member] | Latest Tax Year [Member]
Net Operating Loss Carryforwards, Expiration Year			2037
Domestic Tax Authority [Member] | Separate Return Limitation Year SRLY [Member]
Operating Loss Carryforwards, Total			$ 5,300,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total			$ 80,034,000
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Net Operating Loss Carryforwards, Expiration Year			2027
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Net Operating Loss Carryforwards, Expiration Year			2047