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Note 3 - Going Concern (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 22, 2017
USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance   $ (17,286) $ (15,854)  
Number of Major Customers   1    
Number of Vendors   1    
Supplier Concentration Risk [Member] | Cost of Goods, Product Line [Member]        
Concentration Risk, Percentage 52.00%      
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,500