General and Basis of Presentation (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Segment Reportingunit shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment	1
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Right-of-use assets	$ 1,846,000		$ 0
Lease liabilities	2,037,000
Disaggregation of Revenue [Abstract]
Revenue	31,166,000	$ 32,401,000
Components of Accounts Receivable [Abstract]
Billed accounts receivable	11,738,000		18,848,000
Unbilled receivables	14,144,000		16,000,000
Allowance for doubtful accounts	(306,000)		(306,000)
Receivables - net	25,576,000		34,542,000
Components of Contract Liabilities [Abstract]
Contract liabilities	5,158,000		5,232,000
Revenue recognized included in opening contract liabilities	1,900,000	2,600,000
Revenue, Performance Obligation [Abstract]
Remaining performance obligation	$ 84,600,000
Accounts Receivable [Abstract]
Percentage of initial payment by factor of U.S. Federal government receivables	90.00%
Percentage of initial payment by factor of commercial prime contractors	85.00%
Maximum limit of sold receivables	$ 10,000,000
Sold receivables during the period	5,000,000	3,100,000
Loss recognized in selling, general and administrative expenses	18,000	11,000
Balance of sold receivables	0	900,000	900,000
Deferred price related to sold receivables		100,000	100,000
Inventories [Abstract]
Gross inventory	4,000,000		4,900,000
Inventory valuation reserves	520,000
Software Development Costs [Abstract]
Capitalized software development costs	$ 3,700,000		3,100,000
Software development estimated useful life	2 years
Amortization expense	$ 400,000	200,000
Accumulated amortization	$ 1,700,000		1,300,000
Goodwill [Abstract]
Number of reporting units | Reportingunit	3
Goodwill amortization period for income tax purposes	15 years
Accumulated Other Comprehensive Income [Abstract]
Cumulative foreign currency translation loss	$ (88,000)		(90,000)
Cumulative actuarial gain on pension liability adjustment	107,000		107,000
Accumulated other comprehensive income	19,000		$ 17,000
Firm Fixed-Price [Member]
Disaggregation of Revenue [Abstract]
Revenue	24,930,000	24,921,000
Time-and-Materials [Member]
Disaggregation of Revenue [Abstract]
Revenue	3,928,000	3,767,000
Cost Plus Fixed Fee [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 2,308,000	3,713,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Performance Obligation [Abstract]
Remaining performance obligation percentage	95.40%
Remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Performance Obligation [Abstract]
Remaining performance obligation percentage	4.50%
Remaining performance obligation, expected timing of satisfaction, period
Federal [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 28,984,000	29,711,000
State & Local, and Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenue	$ 2,182,000	$ 2,690,000
Restricted Stock Grants [Member]
Restricted Stock Grants [Abstract]
Restricted stock remained subject to vesting (in shares) | shares	2,427,500
Restricted stock vested on date of grant	25.00%
Restricted stock vest on anniversary of the date of grant	25.00%
ASU 2016-02 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Right-of-use assets	$ 2,000,000
Lease liabilities	2,000,000
ASC 606 [Member]
Revenue from Contract with Customer [Abstract]
Revenue accruals for multiple contracts as a result of cumulative indirect rate adjustments	$ 6,000,000