Long-Term Debt and Notes Payable - Additional Information (Detail)	9 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 SGD	Aug. 22, 2014 USD ($)
Line of Credit Facility [Line Items]
Line of credit agreement collateralized by percentage of own capital stock	65.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Interest rate of borrowings	3.00%
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Borrowings under the revolving credit facility	$ 20,000,000
Maturity of the credit agreement	Aug. 31, 2017
Credit Agreement [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Borrowings under the revolving credit facility			$ 10,000,000
Credit Agreement [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit Agreement basis points	2.50%
Credit Agreement [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Credit Agreement basis points	3.50%
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee on the unused portion of the Credit Agreement	0.375%
Fixed charge coverage ratio	1.25%			1.25%
Adjusted EBITDA	$ 22,000,000
Capital expenditures to adjusted EBITDA	1.0
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee on the unused portion of the Credit Agreement	0.50%
Available borrowings under the revolving credit facility to secure letters of credit	$ 10,000,000
Leverage Ratio	2.00
Fixed charge coverage ratio	1.25%			1.25%
Additional indebtedness	$ 5,000,000
Seamap Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings under the revolving credit facility					$ 15,000,000
Minimum shareholder's equity | SGD				SGD 15,000,000
Seamap Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Minimum ratio of debt to EBITDA	125.00%
Term Loan [Member]
Line of Credit Facility [Line Items]
Carrying value of debt					10,000,000
Frequency of periodic payments	The term loan portion of the Seamap Credit Facility provides for eleven quarterly principal payments of $800,000 and a final payment of the remaining $1.2 million on or before August 22, 2017.
Maturity period	Aug. 22, 2017
Principal payment of term loan portion	$ 800,000
Final payment of term portion	$ 1,200,000
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit Agreement basis points	2.75%
Term Loan [Member] | Seamap Singapore [Member]
Line of Credit Facility [Line Items]
Borrowings under the revolving credit facility	$ 3,000,000
Term Loan [Member] | Minimum [Member] | Seamap Singapore [Member]
Line of Credit Facility [Line Items]
Borrowing period	1 month
Term Loan [Member] | Maximum [Member] | Seamap Singapore [Member]
Line of Credit Facility [Line Items]
Borrowing period	3 months
Singapore Credit Facility Bankers Guarantees [Member]
Line of Credit Facility [Line Items]
Carrying value of debt					2,000,000
Revolving Credit Facility [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Borrowings under the revolving credit facility					$ 3,000,000
Seamap Credit Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Average borrowings under the revolving credit facility	$ 13,900,000	$ 18,300,000