Nature of Business and Summary of Significant Accounting Policies - Income Statement location (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Net sales	$ 43,961,000	$ 49,267,000	$ 130,897,000	$ 138,490,000
Cost of sales	18,834,000	22,783,000	56,665,000	64,581,000
Selling, General and Administrative Expenses
Advertising and promotion costs	526,000	395,000	2,332,000	1,852,000
Cost of sales | Shipping and Handling
Cost of sales	330,000	421,000	1,073,000	1,181,000
Sales revenue, net | Shipping and Handling
Net sales	$ 91,000	$ 93,000	$ 261,000	$ 279,000