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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	9 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Number of Reportable Segments	1
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 61,328	$ 54,036		$ 51,166	$ 49,111	$ 46,896	$ 43,761
Operating Leases, Future Minimum Payments Due, Total	500
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 39,300	$ 38,691		$ 36,487	$ 35,834	$ 35,154	$ 32,342
Accounting Standards Update 2016-02 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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