CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Net sales:
Revenues	$ 28,228,000	$ 26,239,000	$ 78,606,000	$ 78,353,000
Cost of sales:
Cost of sales	15,318,000	14,283,000	43,601,000	42,752,000
Gross Profit	12,910,000	11,956,000	35,005,000	35,601,000
Research and development	1,902,000	1,815,000	5,675,000	5,387,000
Selling, general, and administrative expenses	5,980,000	6,096,000	17,979,000	18,566,000
Operating expenses	7,882,000	7,911,000	23,654,000	23,953,000
Operating Income	5,028,000	4,045,000	11,351,000	11,648,000
Other expense (income):
Interest expense (income), net	44,000	5,000	53,000	3,000
Income before Provision for Income Taxes	4,984,000	4,040,000	11,298,000	11,645,000
Provision for Income Taxes	624,000	425,000	1,422,000	1,225,000
Net Income	$ 4,360,000	$ 3,615,000	$ 9,876,000	$ 10,420,000
Income per share:
Basic (in dollars per share)	$ 0.24	$ 0.20	$ 0.54	$ 0.56
Diluted (in dollars per share)	$ 0.24	$ 0.20	$ 0.54	$ 0.56
Weighted average number of shares outstanding:
Basic (in shares)	18,349,000	18,472,000	18,348,000	18,476,000
Diluted (in shares)	18,412,000	18,516,000	18,402,000	18,530,000
Equipment
Net sales:
Revenues	$ 19,335,000	$ 20,007,000	$ 54,249,000	$ 60,973,000
Cost of sales:
Cost of sales	14,074,000	13,285,000	39,980,000	39,525,000
Services
Net sales:
Revenues	8,893,000	6,232,000	24,357,000	17,380,000
Cost of sales:
Cost of sales	$ 1,244,000	$ 998,000	$ 3,621,000	$ 3,227,000