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Note 3 - Acquisition of SynGen (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jul. 07, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Jun. 30, 2017
Payments to Acquire Businesses, Gross   $ 1,000,000  
SynGen [Member]          
Payments to Acquire Businesses, Gross $ 1,000,000        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 2,000,000        
Percentage Of Common Stock Issued To Acquiree Shareholders 20.00%     20.00%  
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 2,528,000        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     $ 107,000 $ 907,000  
SynGen [Member] | General and Administrative Expense [Member]          
Business Combination, Acquisition Related Costs   $ 208,000