Note 12 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member] - USD ($)	3 Months Ended	6 Months Ended	135 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Stock Issued During Period, Shares, New Issues					37,500
Related Party Transaction, Amounts of Transaction	$ 1,820,000	$ 2,325,000	$ 3,132,000	$ 5,598,000
Accounts Payable, Related Parties, Current	$ 465,000		$ 465,000		$ 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
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-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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant