8. Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 2019

Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]

Share-based compensation expense

	Three Months Ended June 30,
	2019		2018
Cost of revenues	$	17,000	$	35,000
Research and development		22,000		32,000
Selling, general and administrative		253,000		280,000
Total stock-based compensation	$	292,000	$	347,000

Schedule of option activity

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Contractual Term		Aggregate Intrinsic Value
Outstanding at April 1, 2019		165,000		$	72.88
Options granted		–			–
Options exercised		–			–
Options forfeited		(2,000	)		57.91
Options expired		(8,000	)		127.10
Outstanding at June 30, 2019		155,000		$	70.33		7.27	$	77,000
Exercisable at June 30, 2019		84,000		$	115.33		5.67	$	–

Restricted Stock Award Activity

	Number of Shares			Weighted Average Award Date Fair Value per Share
Unvested restricted stock awards outstanding at April 1, 2019		4,000		$	27.96
Restricted stock awards granted		–			–
Restricted stock awards vested		(1,000	)		53.38
Restricted stock awards forfeited		–			–
Unvested restricted stock awards outstanding at June 30, 2019		3,000		$	48.15