Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Former Executive [Member] Common Stock [Member]	Former Executive [Member] Additional Paid-in Capital [Member]	Former Executive [Member] Retained Earnings [Member]	Former Executive [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2017					5,685,381
Balance at Mar. 31, 2017					$ 114	$ 31,577	$ (15,084)	$ 16,607
Issuances of common stock for Director Stock Grants (in shares)					57,501
Issuances of common stock for Director Stock Grants					$ 1	275		$ 276
Issuance of common stock for exercise of stock options for cash (in shares)					29,150			29,150
Issuance of common stock for exercise of stock options for cash						75		$ 75
Share based compensation expense						124		124
Net income (loss)							1,025	1,025
Balance (in shares) at Mar. 31, 2018					5,772,032
Balance at Mar. 31, 2018					$ 115	32,051	(14,059)	18,107
Issuances of common stock for Director Stock Grants (in shares)					47,223
Issuances of common stock for Director Stock Grants					$ 1	169		$ 170
Issuance of common stock for exercise of stock options for cash (in shares)					49,600			49,600
Issuance of common stock for exercise of stock options for cash					$ 1	107		$ 108
Share based compensation expense						152		152
Net income (loss)							(3,596)	(3,596)
Issuances of vested shares of restricted stock (in shares)					16,003
Issuances of vested shares of restricted stock						(32)		(32)
Shares withheld for tax payments (in shares)					(5,148)
Shares withheld for tax payments
Balance (in shares) at Mar. 31, 2019					5,879,710
Balance at Mar. 31, 2019					$ 117	32,447	(17,655)	14,909
Issuances of common stock for Director Stock Grants (in shares)					74,882
Issuances of common stock for Director Stock Grants					$ 1	157		$ 158
Issuance of common stock for exercise of stock options for cash (in shares)					2,112			2,112
Issuance of common stock for exercise of stock options for cash						4		$ 4
Share based compensation expense						99		99
Net income (loss)							387	387
Issuances of vested shares of restricted stock (in shares)					22,489
Issuances of vested shares of restricted stock					$ 1	(32)		(31)
Shares withheld for tax payments (in shares)	(18,629)				(7,672)
Shares withheld for tax payments
Issuance of common stock in connection with severance of former executive (in shares)					58,993
Issuance of common stock in connection with severance of former executive					$ 1	319		320
Balance (in shares) at Mar. 31, 2020					6,011,885
Balance at Mar. 31, 2020					$ 120	$ 32,994	$ (17,268)	$ 15,846