Note 6 - Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2020:
Assets:
Cash equivalents	$	35,613	$	35,613	$	—	$	—
Marketable securities	$	10,191	$	10,191	$	—	$	—

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2020:
Assets:
Cash equivalents	$	19,394	$	19,394	$	—	$	—
Marketable securities	$	35,195	$	35,195	$	—	$	—