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Summary of Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2020

Accounting Policies [Abstract]

Disaggregation of Revenue [Table Text Block]

Total revenue recognized over time as POC was approximately $38.0 million and $45.3 million of the $41.5 million and $49.5 million reported for the years ended April 30, 2020 and 2019, respectively. The amounts by segment and product line were as follows:

		Year Ended April 30, 2020
		(In thousands)
		POC Revenue				POT Revenue				Total Revenue
FEI-NY		$	28,720			$	3,031			$	31,751
FEI-Zyfer			9,210				1,704				10,914
Intersegment			(88	)			(1,070	)			(1,158	)
Revenue		$	37,842			$	3,665			$	41,507

		Year Ended April 30, 2019
		(In thousands)
		POC Revenue				POT Revenue				Total Revenue
FEI-NY		$	35,588			$	2,508			$	38,096
FEI-Zyfer			9,803				2,432				12,235
Intersegment			(62	)			(760	)			(822	)
Revenue		$	45,329			$	4,180			$	49,509

Revenue from External Customers by Products and Services [Table Text Block]

		Years Ended April 30,
		(In thousands)
		2020				2019
Revenue by Product Line:
Satellite Revenue		$	20,422			$	22,810
Government Non-Space Revenue			16,939				22,771
Other Commercial & Industrial Revenue			4,146				3,928
Consolidated revenues		$	41,507			$	49,509

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The weighted average fair value of each option or SAR has been estimated on the date of grant using the Black-Scholes option pricing model with the following range of weighted average assumptions used for grants:

		Years ended April 30
		2020				2019
Expected volatility			-	%			35	%
Dividend yield			-	%			0.0	%
Risk-free interest rate			-	%			2.81% - 3.07	%
Expected lives			-			5.0 years

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Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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