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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Purchase Commitment, Remaining Minimum Amount Committed $ 1,200,000  
Inventory Write-down $ 55,000 $ 786,000
Shalon Ventures License Agreement [Member] | Board of Directors Chairman [Member] | Shalon Ventures [Member]    
Royalty Revenue, Percentage 8.00%  
Shalon Ventures [Member] | Shalon Ventures License Agreement [Member] | Former Director [Member]    
Royalty Revenue, Percentage 58.00%  
Shalon Ventures License Agreement [Member]    
Royalty Expense, Percentage of Net Sales 3.00%  
Royalty Expense, Threshold Amount for Additional Costs $ 10,000  
Shalon Ventures License Agreement [Member] | Cost of Sales [Member]    
Royalty Expense 35,000 $ 5,000
Purchase Commitment [Member] | Accrued Expenses [Member]    
Inventory Write-down $ 200,000