Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Discount rate from fair value on offering date that participants pay for shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Price of a single share of a number of saleable stocks of a company.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Number of new stock issued during the period.

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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 26, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				7 years 222 days
Share Price		$ 1.80		$ 1.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 400	$ 700	$ 400	$ 700
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		2,500		2,500
Allocated Share-based Compensation Expense		443	630	1,649	1,867
Proceeds from Issuance of Common Stock				$ 4,909
June 2017 Direct Offering [Member]
Share Price	$ 2.50
Stock Issued During Period, Shares, New Issues	2,184,000
Proceeds from Issuance of Common Stock	$ 4,900
June 2017 Direct Offering [Member] \| Placement Agency Fees [Member]
Payments of Stock Issuance Costs	300
June 2017 Direct Offering [Member] \| Other Offering Expenses [Member]
Payments of Stock Issuance Costs	$ 200
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date				85.00%
Allocated Share-based Compensation Expense		20	20	$ 60	$ 70
Stock Issued During Period, Shares, New Issues				41,205	46,604
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding		500	$ 300	$ 500	$ 300
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 600		$ 600
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 226 days
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years 47 days