Note 11 - Contracts With Customers - Concentration of Customers (Details)	6 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| El Camino, Los Gatos, & Other Facilities [Member]
Concentration Risk, Percentage	23.60%	22.26%

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
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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
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-Section 50
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