Note L - Engineering and Development Costs	12 Months Ended
Jun. 30, 2021
Notes to Financial Statements
Research, Development, and Computer Software Disclosure [Text Block]	L. ENGINEERING AND DEVELOPMENT COSTS Engineering and development costs include research and development expenses for new products, development and major improvements to existing products, and other costs for ongoing efforts to refine existing products. Research and development costs charged to operations totaled $1,867 and $1,820 in fiscal 2021 and 2020, respectively. Total engineering and development costs were $8,535 and $10,998 in fiscal 2021 and 2020, respectively.

The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 730
-URI http://asc.fasb.org/subtopic&trid=2197926

Name:	us-gaap_ResearchDevelopmentAndComputerSoftwareDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration