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Revenue Recognition and Contracts with Customers (Tables) | 12 Months Ended
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Jun. 30, 2023
Revenue Recognition and Contracts with Customers |
Schedule of disaggregation of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal year ended June 30,
​ | ​ | 2023 |  | 2022 |  | 2021
Major Product Lines: | ​ | ​ |  |  | ​ |  |  | ​ |
Intrusion and access alarm products | ​ | $ | 47,344 | ​ | $ | 49,606 | ​ | $ | 36,794
Door locking devices | ​ |  | 62,718 | ​ |  | 48,006 | ​ |  | 43,337
Services | ​ |  | 59,935 | ​ |  | 45,981 | ​ |  | 33,904
Total Revenues | ​ | $ | 169,997 | ​ | $ | 143,593 | ​ | $ | 114,035
Schedule of the allowance for doubtful accounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Balance at beginning of period |  | Charged to costs and expenses |  | Deductions/ (recoveries) |  | Balance at end of period
For the Year Ended June 30, 2021: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 326 | ​ | $ | 30 | ​ | $ | (130) | ​ | $ | 226
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30, 2022: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 226 | ​ | $ | 17 | ​ | $ | — | ​ | $ | 243
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30, 2023: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses | ​ | $ | 243 | ​ | $ | 6 | ​ | $ | (118) | ​ | $ | 131

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