Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Current assets:
Cash and cash equivalents	$ 115,122	$ 99,180
Accounts receivable, net of allowance for expected credit losses of $717 and $1,220, respectively	24,957	25,732
Contract assets	1,628	2,364
Inventories	3,256	1,177
Prepaid expenses and other current assets	4,651	4,797
Total current assets	149,614	133,250
Property and equipment, net	6,788	8,789
Operating lease right-of-use assets	9,681	12,210
Goodwill	19,622	19,622
Intangible assets, net	8,400	8,400
Deferred income taxes, non-current	2,281	1,802
Other non-current assets	5,952	5,800
Total assets	202,338	189,873
Current liabilities:
Accounts payable	8,035	6,346
Contract liabilities	43,193	38,394
Accrued liabilities	8,385	11,233
Operating lease liabilities, current	4,531	5,009
Finance lease obligations, current	7	19
Total current liabilities	64,151	61,001
Deferred income taxes, non-current	937	923
Operating lease liabilities, non-current	6,187	8,597
Finance lease obligations, non-current	3	6
Other non-current liabilities	3,647	4,011
Commitments and contingencies (see Note 7)
Shareholders' equity:
Common shares, without par value, at $0.30 stated value; 80,000,000 shares authorized; 31,606,831 shares issued; and 24,712,343 and 24,010,727 shares outstanding at December 31, 2021 and March 31, 2021, respectively	9,482	9,482
Treasury shares, 6,894,488 and 7,596,104 at December 31, 2021 and March 31, 2021, respectively	(2,068)	(2,278)
Capital in excess of stated value	46,436	37,257
Retained earnings	38,495	35,376
Accumulated other comprehensive income	68	39
Total shareholders' equity	92,413	79,876
Total liabilities and shareholders' equity	202,338	189,873
Series A Convertible Preferred Stock [Member]
Liabilities Noncurrent:
Series A convertible preferred stock, no par value	$ 35,000	$ 35,459