Income Taxes (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2017	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Income before income tax provision [Abstract]
U.S. operations			$ (1,302)	$ (948)	$ 4,758
Foreign operations (primarily South American operations)			528	1,102	(80)
(Loss) Income before income tax provision			(774)	154	4,678
Current income tax provision (benefit) [Abstract]
Federal			78	(62)	(149)
State			90	26	42
Foreign			494	228	282
Total current			662	192	175
Deferred income tax provision (benefit) [Abstract]
Federal			(24)	289	1,653
State			1	(75)	308
Foreign			(1,303)	(148)	31
Total deferred			(1,326)	66	1,992
Total income tax (benefit) provision			$ (664)	$ 258	$ 2,167
Statutory federal tax rate	34.00%	21.00%	21.00%	26.50%	34.00%
Reconciliation of income tax provision from statutory U.S. income tax rate to the effective income tax rate [Abstract]
Income tax (benefit) provision at the U.S. federal statutory income tax rate			$ (163)	$ 41	$ 1,590
Tax on Foreign Earnings			138	129	0
Change in Tax Rates under Tax Act			16	322	0
International rate differences			80	27	33
Peru non-deductible expenses			0	14	53
Foreign dividend income			0	0	240
Income from "pass-through" entities taxable to noncontrolling partners			(16)	0	(1)
Re-evaluation and settlements of tax contingencies			0	0	(33)
Transaction costs			69	0	0
Change in valuation allowance			(1,241)	(19)	98
State taxes, net of federal benefit			75	(32)	200
Other foreign taxes, net of federal benefit			109	(95)	(111)
Other permanent differences			269	(129)	98
Total income tax (benefit) provision			(664)	258	2,167
Deferred tax assets [Abstract]
Net operating loss carryforwards						$ 1,413	$ 1,081
Accrued compensation and expenses						623	611
Federal benefit from foreign accounting differences						448	460
Contract and other reserves						253	311
Foreign tax credit						296	296
Capital loss carryforwards						234	143
Fixed assets and intangibles						57	0
Other						155	202
Deferred tax assets						3,479	3,104
Less: Valuation allowance	$ (2,020)	$ (2,006)	$ (859)	(2,006)	(2,020)	(859)	(2,006)	$ (2,020)
Net deferred tax assets						2,620	1,098
Deferred tax liabilities [Abstract]
Fixed assets and intangibles						0	(39)
Federal expense on state deferred taxes						(62)	(60)
Federal expense from foreign accounting differences						(2)	(7)
Unremitted foreign earnings						(417)	(206)
Other						(9)	3
Net deferred tax liabilities						(490)	(309)
Foreign operating loss carryforwards						3,000
State operating loss carryforwards						1,400
Net operating loss carryforwards expiration period			4 years
Provision of global intangible low taxed income, amount			$ 600
Deferred tax assets valuation allowance [Abstract]
Balance at beginning of period	$ 2,020		2,006	2,020
Additions during the period			420	60
Reductions during period			(1,567)	(74)
Balance at end of period		$ 2,006	859	2,006	2,020
Amount of undistributed income that will not be indefinitely reinvested in foreign operations						200	200	600
Undistributed foreign earnings						4,100	6,300	$ 5,600
Foreign earnings			2,300	1,000
Uncertain tax positions [Abstract]
Uncertain tax positions						$ 0	$ 0
Maximum [Member]
Uncertain tax positions [Abstract]
Interest accrued related to liabilities for uncertain tax positions			$ 100	$ 100	$ 100
IRS [Member]
Income Tax Examination [Abstract]
Income tax examination, year subject to examination			2019 2018 2017 2016
State, Local and Foreign [Member]
Income Tax Examination [Abstract]
Income tax examination, year subject to examination			2019 2018 2017 2016 2015