Note 13 - Income Taxes - Reconciliation of Federal Income Tax Attributable to Operations to Income Tax Expense (Benefit) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Jun. 30, 2017
Statutory federal income tax benefit	$ (1,703,000)	$ (9,591,000)	$ (10,121,000)
Intangible assets		3,119,000
Change in valuation allowance		(2,084,000)
Expiration of net operating losses	(14,427,000)	1,271,000	2,281,000
United States tax reform rate change	13,658,000
Disallowed financing costs	149,000	240,000	6,959,000
State and local taxes	60,000	2,344,000	88,000
Other	25,000	(29,000)	120,000
Total income tax benefit	$ (2,238,000)	$ (4,730,000)	$ (673,000)