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Note 5 - Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 5. Property and Equipment Property and equipment consists of the following:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Laboratory equipment |  | $ | 182,357 |  |  | $ | 182,357 |
Furniture and office equipment |  |  | 155,113 |  |  |  | 137,290 |
Leasehold improvements |  |  | 430,000 |  |  |  | — |
Total property and equipment |  |  | 767,470 |  |  |  | 319,647 |
Less: accumulated depreciation |  |  | (306,818 | ) |  |  | (239,892 | )
Property and equipment, net |  | $ | 460,652 |  |  | $ | 79,755 |
Depreciation expense was approximately $68,000 and $25,000 for the years ended December 31, 2017 and 2016, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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