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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | AVALON HOLDINGS CORPORATION AND SUBSIDIARIES SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2018 AND 2017 (in thousands)
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |
DESCRIPTION |  | Balance at Beginning of Year |  |  | Charged (Credited) to Costs and Expenses |  |  | Charged to Other Accounts |  |  | Deductions / (Recoveries) |  |  | Balance at End of Year |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 237 |  |  | $ | 42 |  |  | $ | - |  |  | $ | 24 | (1) |  | $ | 255 |
Deferred tax asset valuation allowance |  | $ | 1,313 |  |  | $ | 568 | (2) |  | $ | - |  |  | $ | - |  |  | $ | 1,881 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 235 |  |  | $ | 6 |  |  | $ | - |  |  | $ | 4 | (1) |  | $ | 237 |
Deferred tax asset valuation allowance |  | $ | 1,453 |  |  | $ | (140) | (2) |  | $ | - |  |  | $ | - |  |  | $ | 1,313 |
( 1 ) Accounts receivable written-off as uncollectible, net of recoveries. ( 2 ) Change in valuation allowance primarily for deferred tax assets when it is more likely than not that the deferred tax assets will not be realized.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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