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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 27,908	$ 21,117	$ 53,328	$ 42,329
Grid [Member]
Revenues	24,619	16,347	48,119	34,062
Grid [Member] | Americas [Member]
Revenues	18,115	15,677	40,760	26,231
Grid [Member] | Asia Pacific [Member]
Revenues	3,269	370	3,867	6,385
Grid [Member] | EMEA [Member]
Revenues	3,235	300	3,492	1,446
Wind [Member]
Revenues	3,289	4,770	5,209	8,267
Wind [Member] | Americas [Member]
Revenues	59	30	78	42
Wind [Member] | Asia Pacific [Member]
Revenues	3,220	4,734	5,091	8,002
Wind [Member] | EMEA [Member]
Revenues	10	6	40	223
Equipment and Systems [Member] | Grid [Member]
Revenues	23,031	15,261	44,189	31,798
Equipment and Systems [Member] | Wind [Member]
Revenues	1,826	4,059	2,860	6,676
Services and Technology Development [Member] | Grid [Member]
Revenues	1,588	1,086	3,930	2,264
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 1,463	$ 711	$ 2,349	$ 1,591

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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