Note 12 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member] - USD ($)	3 Months Ended	135 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Stock Issued During Period, Shares, New Issues			37,500
Related Party Transaction, Amounts of Transaction	$ 1,489,000	$ 3,273,000
Accounts Payable, Related Parties, Current	$ 619,000		$ 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).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant