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Note 17 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2019 MWh
Number of Reportable Segments			2
Share-based Payment Arrangement, Expense	$ 249	$ 785
Restructuring Charges, Total	0	310
Corporate, Non-Segment [Member]
Share-based Payment Arrangement, Expense	$ 200	800
Restructuring Charges, Total		$ 300
Minimum [Member]
Power of Wind Turbines | MWh			2

X

- Definition

Represents the power of wind turbines, expressed in megawatts.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Name Accounting Standards Codification
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-Section S99
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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-Topic 420
-SubTopic 10
-Section S99
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