Goodwill, Long-lived Assets and Other Intangibles Long-lived asset impairment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Long-lived asset impairment loss	$ 259	$ 0
Other Nonoperating Income (Expense) [Member] | AgEagle Aerial Systems [Member] | Applied Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Equity Method Investment, Other than Temporary Impairment	72	0
Operating Income (Loss) [Member] | AgEagle Aerial Systems [Member] | Customer-Related Intangible Assets [Member] | Applied Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Long-lived asset impairment loss	$ 259	$ 0