| Note 8 - Inventory | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes to Financial Statements | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Inventory Disclosure [Text Block] | 
 The components of net inventory at   December 31,  201 7and 2016,net of reserves of $748and $0,respectively, are as follows: 
 During 2016,we utilized $131,000of Tc99mtilmanocept inventory for clinical study and product development purposes. Also during 2016,we recorded obsolescence reserves of $43,000of Tc99mtilmanocept inventory related to specific lots that expired or were nearing product expiry and therefore were nolonger expected to be sold. See Note 1(h). Inventory in the amount of  $1,374,618as of  December 31, 2016 has been reclassified to current assets associated with discontinued operations. See Note 3. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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- References No definition available. 
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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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