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Note 6 - 2012 Financing (Detail) - Notes and interest payable to related-party stockholders, net: (USD $)
Mar. 31, 2013
Dec. 31, 2012
Total notes and interest payable to related party stockholders, net $ 2,861,000 $ 2,599,000
Related Party Stockholders [Member]
   
Notes payable to related party stockholders 3,000,000  
Unamortized discount on notes payable to related party stockholders (318,000)  
Total notes payable to related party stockholders, net 2,682,000  
Interest payable to related party stockholders 180,000  
Total notes and interest payable to related party stockholders, net $ 2,862,000