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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2021
SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION |
Supplemental Information, Balance Sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2020 |  | 2021
a. Other assets: |  | ​ |  |  | ​ |
Institutions | ​ | $ | 771 | ​ | $ | 311
Restricted deposits | ​ |  | 436 | ​ |  | ​
Prepaid expenses | ​ |  | 841 | ​ |  | 905
Sundry | ​ |  | 48 | ​ |  | 69
​ | ​ | $ | 2,096 | ​ | $ | 1,285
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2020 |  | 2021
b. Accounts payable and accruals – other: |  | ​ |  |  | ​ |
Payroll and related expenses | ​ | $ | 1,460 | ​ | $ | 1,562
Interest payable | ​ |  | 555 | ​ |  | 767
Provision for vacation | ​ |  | 1,526 | ​ |  | 1,506
Accrued expenses | ​ |  | 9,586 | ​ |  | 11,981
Royalties payable | ​ |  | 482 | ​ |  | 522
Property and equipment suppliers | ​ |  | 317 | ​ |  | 95
​ | ​ | $ | 13,926 | ​ | $ | 16,433

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