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2. SUMMARY OF ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Radnet, Inc.'s common stockholders | $ (7,276) | $ 3,229 | $ 5,310 | $ (1,210) | $ 3,681 | $ 1,647 | $ 3,625 | $ (1,723) | $ 53 | $ 7,230 | $ 7,709
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic | 47,237 | 46,954 | 46,756 | 46,560 | 45,967 | 45,869 | 46,559 | 46,581 | 46,880,775 | 46,244,188 | 43,805,794
Basic net income per share attributable to Radnet, Inc. common stockholders | $ (0.15) | $ 0.07 | $ 0.11 | $ (0.03) | $ 0.08 | $ 0.04 | $ 0.08 | $ (0.04) | $ 0.00 | $ 0.16 | $ 0.18
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic | 47,237 | 46,954 | 46,756 | 46,560 | 45,967 | 45,869 | 46,559 | 46,581 | 46,880,775 | 46,244,188 | 43,805,794
Add nonvested restricted stock subject only to service vesting |  |  |  |  |  |  |  |  | 274,940 | 220,416 | 865,326
Add additional shares issuable upon exercise of stock options and warrants |  |  |  |  |  |  |  |  | 246,206 | 190,428 | 500,252
Weighted average number of shares used in calculating diluted net income per share | 47,886 | 47,578 | 47,196 | 46,560 | 46,389 | 46,334 | 46,882 | 46,581 | 47,401,921 | 46,655,032 | 45,171,372
Diluted net income per share attributable to RadNet, Inc. common stockholders | $ (0.15) | $ 0.07 | $ 0.11 | $ (0.03) | $ 0.08 | $ 0.04 | $ 0.08 | $ (0.04) | $ 0.00 | $ 0.15 | $ 0.17
Stock options excluded from the computation of diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for which the exercise price exceeds average market price of common stock |  |  |  |  |  |  |  |  | 175,037 | 245,313 | 260,000

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