Note 11 - Equity  | 
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2020  | |||
| Notes to Financial Statements | |||
| Stockholders' Equity Note Disclosure [Text Block] | 
 In    December 2019,  the Company executed a Stock Purchase Agreement with the investors named therein. Pursuant to the Stock Purchase Agreement, the investors agreed to purchase approximately 2.1  million shares of the Company’s Common Stock in a private placement for aggregate gross proceeds to the Company of approximately $1.9  million. Of this amount, approximately $1.1  million was received during 2019,  resulting in approximately $812,000  of stock subscriptions receivable as of  December 31, 2019.  The remaining $812,000  of proceeds were received and the related Common Stock was issued in  January 2020.  In accordance with current accounting guidance, the $812,000  of stock subscriptions receivable was included in accounts and other receivables in the consolidated balance sheet at  December 31, 2019. 
In    February 2020,  the Company executed agreements with two  existing investors to purchase approximately 4.0  million shares of the Company’s Common Stock for aggregate gross proceeds to Navidea of approximately $3.4  million. Of this amount, approximately $850,000  was received during the first  quarter of 2020.  An additional $1.7  million was received and the related Common Stock was issued during the second  quarter of 2020  through the date of filing this Quarterly Report on Form 10 -Q. As a result, the Company recorded approximately $1.7  million of stock subscriptions receivable as of  March 31, 2020.  The remaining $913,000  of proceeds have not  been received as of the date of filing this Quarterly Report on Form 10 -Q. In accordance with current accounting guidance, the $1.7  million of stock subscriptions receivable was included in accounts and other receivables, and the $913,000  of stock subscriptions receivable was included in common stock subscriptions receivable in the consolidated balance sheet at  March 31, 2020. 
Navidea intends to use the net proceeds from these transactions to fund its research and development programs, including continued advancement of its   two  Phase 2b  and Phase 3  clinical trials of Tc99m  tilmanocept in patients with rheumatoid arthritis, and for general working capital purposes and other operating expenses. See Note 2. 
During the  
three -month period ended  March 31, 2020,  we issued 53,315  shares of our common stock valued at $65,000  to our employees as partial payment in lieu of cash for their 2019  bonuses. |