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, 2016	Jun. 30, 2017	Jun. 30, 2016
Statutory federal income tax benefit	$ (1,703,000)		$ (10,121,000)	$ (6,300,000)
Unbenefited net operating losses and credits	(14,427,000)		2,281,000	3,391,000
United States tax reform rate change	13,658,000
Disallowed financing costs	149,000		6,959,000	2,607,000
State and local taxes	60,000		88,000	69,000
Other	25,000		120,000	233,000
Total income tax benefit	$ (2,238,000)		$ (673,000)