Note 11 - Contracts With Customers (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Restocking Fee, Percentage	50.00%		50.00%
Prostate Brachytherapy [Member] \| Revenue Benchmark [Member] \| Product Concentration Risk [Member]
Concentration Risk, Percentage	89.00%	89.00%
Product and Service, Other [Member] \| Revenue Benchmark [Member] \| Product Concentration Risk [Member]
Concentration Risk, Percentage	11.00%	11.00%
Geographic Distribution, Foreign [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 0		$ 0

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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