Description of Business and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Mar. 31, 2017 USD ($) customer	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Unbilled Accounts Receivable
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 362,000
Deferred Revenue
Billings in excess of costs and estimated earnings on uncompleted contracts	798,000
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets	2,108,000	$ 1,505,000
Cash designated as collateral on performance bonds	$ 535,000
Percentage of cash value of the bonds as collateral	100.00%
Goodwill and Long-Lived Assets
Loss on impairment of goodwill	$ 2,168,000
Impairment of long-lived and intangible assets	0
Income Taxes
Valuation allowance on deferred tax assets	11,726,000	10,561,000		$ 10,100,000
Advertising Expenses
Advertising costs	146,000	$ 164,000	$ 134,000
Operating segments
Goodwill and Long-Lived Assets
Loss on impairment of goodwill	2,168,000
Operating segments | Agriculture and Weather Analytics
Goodwill and Long-Lived Assets
Loss on impairment of goodwill	$ 2,168,000
Total Revenues
Concentration of Credit Risk
Percentage of total revenue	2.00%	1.00%	3.00%
Total Revenues | Customer | One individual customer
Concentration of Credit Risk
Number of customers | customer	1
Minimum
Warranty
Warranty period	1 year
Minimum | Property and equipment
Property and Equipment
Useful life	3 years
Minimum | Total Revenues | Customer | One individual customer
Concentration of Credit Risk
Percentage of total revenue	10.00%
Maximum
Warranty
Warranty period	3 years
Maximum | Property and equipment
Property and Equipment
Useful life	8 years