Note L - Stock-based Compensation - Shares Available for Future Options (Details) - Stock Options [Member] - shares	Jun. 30, 2020	Jun. 30, 2019
The 2018 Long-Term Incentive Plan [Member]
Shares Available for Grant (in shares)	492,591	742,325
Stock Incentive Plan for Non-employee Directors 2010 [Member]
Shares Available for Grant (in shares)	12,865	61,354

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant