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Note H - Segment Information (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Number of Reportable Segments | 2 |
Revenue from Contract with Customer, Including Assessed Tax | $ 38,340 | $ 39,726
Non-US [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 14,845 | 19,941
UNITED STATES |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 23,495 | $ 19,785
Products Manufactured by NAIE [Member] | Non-US [Member] | Product Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Concentration Risk, Percentage | 80.00% | 86.00%
Products Manufactured by NAIE [Member] | UNITED STATES |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 0 | $ 0

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