Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2023	Jun. 30, 2023
Current assets:
Cash and cash equivalents	$ 1,984,279	$ 3,091,062
Short-term investments	17,183,653	17,064,274
Accounts receivable, less allowance for credit losses of $1,922 and $6,027, respectively	1,331,124	1,379,517
Inventories	5,778,872	6,423,441
Prepaid expenses and other current assets	462,663	284,622
Interest receivable	56,393	51,150
Income taxes receivable	127,363	86,901
Total current assets	26,924,347	28,380,967
Equipment and leasehold improvements, net	1,221,007	953,903
Other assets:
Operating lease right-of-use asset	2,942,900	3,015,887
Cash surrender value of life insurance	6,250,849	6,020,048
Total other assets	9,193,749	9,035,935
Total assets	37,339,103	38,370,805
Current liabilities:
Accounts payable	228,545	267,513
Accrued liabilities	498,183	970,530
Deferred revenue	352,731	450,312
Operating lease liability	230,454	236,225
Income taxes payable	1,879	87,237
Total current liabilities	1,311,792	2,011,817
Long-term liabilities:
Deferred compensation	1,937,185	1,997,120
Deferred revenue	117,377	113,003
Operating lease liability	2,722,671	2,787,970
Total long-term liabilities	4,777,233	4,898,093
Total liabilities	6,089,025	6,909,910
Stockholders' equity:
Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 9,234,795	46,174	46,174
Paid in capital	13,160,785	13,113,993
Retained earnings	18,043,119	18,300,728
Total stockholders' equity	31,250,078	31,460,895
Total liabilities and stockholders' equity	$ 37,339,103	$ 38,370,805