Note 3 - Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2018

Notes to Financial Statements

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

( 3 ) Valuation and Qualifying Accounts

Activity in the Company's valuation and qualifying accounts consists of the following (in thousands):

	Year Ended March 31,
	2018			2017			2016
Allowance for doubtful accounts:
Balance at beginning of period	$	27		$	13		$	8
Provision for doubtful accounts		112			421			260
Write-off of uncollectible accounts receivable		(104	)		(407	)		(255	)
Balance at end of year	$	35		$	27		$	13