Note 12 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member] - USD ($)	3 Months Ended	9 Months Ended	120 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Stock Issued During Period, Shares, New Issues					375
Related Party Transaction, Amounts of Transaction	$ 720,000	$ 3,015,000	$ 3,853,000	$ 8,613,000
Accounts Payable, Related Parties, Current	$ 456,000		$ 456,000		$ 456,000	$ 960,000

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant