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Accounts receivable net | 12 Months Ended
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Dec. 31, 2022
Accounts receivable, net | Note 4: Accounts receivable, net Accounts receivable, net consisted of the following at December 31,:
|  | 2022 |  |  | 2021 |
|  | US$’000 |  |  | US$’000 |
Contract receivables |  |  | 1,614 |  |  |  | 3,661 |
Less: allowance for doubtful accounts |  |  | (28 | ) |  |  | (30 | )
|  |  | 1,586 |  |  |  | 3,631 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
|  | 2022 |  |  | 2021 |
|  | US$’000 |  |  | US$’000 |
Balance at beginning of period |  |  | 30 |  |  |  | 30 |
Less : reversal in allowances |  |  | (2 | ) |  |  | - |
Balance at end of period |  |  | 28 |  |  |  | 30 |
The following is an aging analysis of accounts receivable, net at December 31:
|  | 2022 |  |  | 2021 |
|  | US$’000 |  |  | US$’000 |
Current |  |  | 710 |  |  |  | 1,441 |
Past due |  |  |  |  |  |  |  |
1-30 days |  |  | 477 |  |  |  | 1,570 |
31-60 days |  |  | 311 |  |  |  | 495 |
61-90 days |  |  | 32 |  |  |  | 108 |
Greater than or equal to 91 days |  |  | 56 |  |  |  | 17 |
|  |  | 876 |  |  |  | 2,190 |
|  |  | 1,586 |  |  |  | 3,631 |
ZHEJIANG TIANLAN |
Accounts receivable, net |
4. | Accounts receivable, net
Accounts receivable, net consisted of the following at December 31:
|  | 2022 |  |  | 2021 |
|  | RMB’000 |  |  | RMB’000 |
Contract receivables |  |  | 175,792 |  |  |  | 148,889 |
Less: allowance for doubtful accounts |  |  | (40,019 | ) |  |  | (42,867 | )
|  |  | 135,773 |  |  |  | 106,022 |
The roll-forward of activity in the allowance for doubtful accounts was as follows for the years ended December 31:
|  | 2022 |  |  | 2021 |
|  | RMB’000 |  |  | RMB’000 |
Balance at beginning of year |  |  | 42,867 |  |  |  | 42,182 |
Add: provision for allowances |  |  | 822 |  |  |  | 868 |
Less: reversal of provision for doubtful accounts |  |  | (983 | ) |  |  | (183 | )
Less: write-off of doubtful accounts |  |  | (2,687 | ) |  |  | - |
Balance at end of year |  |  | 40,019 |  |  |  | 42,867 |
The following is an aging analysis of accounts receivable, net at December 31:
|  | 2022 |  |  | 2021 |
|  | RMB’000 |  |  | RMB’000 |
Within 1 year |  |  | 111,436 |  |  |  | 82,534 |
1 year - 2 years |  |  | 12,236 |  |  |  | 12,144 |
2 years - 3 years |  |  | 1,437 |  |  |  | 5,111 |
3 years - 4 years |  |  | 6,132 |  |  |  | 5,141 |
4 years - 5 years |  |  | 4,532 |  |  |  | 1,092 |
|  |  | 135,773 |  |  |  | 106,022 |
At December 31, 2022, the accounts receivable, net pledged as security for the Company’s bank loans and third party loans amounted to RMB Nil (2021: RMB Nil).

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + Details
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