Note 10 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member] - USD ($)		3 Months Ended		6 Months Ended
	Oct. 04, 2007	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Stock Issued During Period, Shares, New Issues	37,500
Related Party Transaction, Amounts of Transaction		$ 1,681,000	$ 945,000	$ 3,706,000	$ 2,160,000
Accounts Payable, Related Parties, Current		$ 637,000		$ 637,000		$ 1,297,000