Restatement of Previously Issued Financial Statements - Consolidated statements of cash flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 15,413	$ 7,795	$ 12,481
Change to inventory obsolescence reserve	(79)	624	(582)
Deferred income taxes	337	(47)	755
Changes in operating assets and liabilities:
Accounts payable, accrued expenses, accrued salaries and wages, accrued income taxes	1,889	1,926	1,580
Net Cash Provided by Operating Activities	22,987	$ 10,305	$ 8,653
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	14,901
Change to inventory obsolescence reserve	519
Deferred income taxes	235
Changes in operating assets and liabilities:
Accounts payable, accrued expenses, accrued salaries and wages, accrued income taxes	$ 1,906