Note 6 - Commitments and Contingencies (Details Textual) - USD ($)		1 Months Ended	6 Months Ended
	May 04, 2017	Oct. 31, 2017	Jun. 30, 2019
Payment Terms, Severance Compensation			1 year
Short Term Investment Minimum			$ 2,000,000
Litigation Related to Strategic Advisory Services [Member]
Loss Contingency, Damages Sought, Value	$ 1,000,000
Loss Contingency, Damages Sought, Value, Interest			300,000
Loss Contingency, Negotiation Condition Bond		$ 1,000,000
Loss Contingency Accrual, Ending Balance			$ 0