Supplementary Financial Information - Intangible Assets (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Intangible Assets
Gross Carrying Amount	$ 5,874,000	$ 4,704,000
Accumulated Amortization	(4,376,000)	(3,753,000)
Amortization expense	623,000	526,000	$ 597,000
Amortization recorded to cost of revenues	342,000	166,000	166,000
Amortization of intangible assets	281,000	360,000	$ 431,000
Future estimated amortization expense
Total	1,498,000	951,000
Agriculture and Weather Analytics
Future estimated amortization expense
2018	650,000
2019	571,000
2020	277,000
Total	1,498,000
Technology
Intangible Assets
Gross Carrying Amount	1,856,000	1,856,000
Accumulated Amortization	(1,828,000)	(1,708,000)
Customer contracts / relationships
Intangible Assets
Gross Carrying Amount	750,000	750,000
Accumulated Amortization	(726,000)	(622,000)
Trade names and non-compete agreements
Intangible Assets
Gross Carrying Amount	1,110,000	1,110,000
Accumulated Amortization	(1,066,000)	(1,008,000)
Capitalized software development costs
Intangible Assets
Gross Carrying Amount	2,158,000	988,000
Accumulated Amortization	$ (756,000)	$ (415,000)