Note 4 - Liquidity Risks and Management's Plans (Details Textual) - USD ($) $ in Thousands	Dec. 21, 2018	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 11,187	$ 1,815
Debt Securities, Available-for-sale, Current, Total		13,959
Liabilities, Current, Total		20,633	$ 11,760
Loans Payable, Current, Total		$ 8,000
Private Placement Financing, Value	$ 39,000
Common Stock, Shares Authorized		120,000,000	120,000,000
Preferred Stock, Shares Authorized		5,000,000	5,000,000
Common Stock, Capital Shares Available for Issuance		72,000,000
Preferred Stock, Capital Shares Available for Issuance		5,000,000