Revenue Recognition and Contracts with Customers - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of revenue:
Revenues	$ 28,228	$ 26,239	$ 78,606	$ 78,353
Equipment
Disaggregation of revenue:
Revenues	19,335	20,007	54,249	60,973
Intrusion and Access alarm products
Disaggregation of revenue:
Revenues	8,956	8,409	24,517	24,163
Door locking devices
Disaggregation of revenue:
Revenues	10,379	11,598	29,732	36,810
Services
Disaggregation of revenue:
Revenues	$ 8,893	$ 6,232	$ 24,357	$ 17,380