Note 10 - Prepaid and Other Current Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
Employee Retention Credits Receivable							$ 3,300
Proceeds From Employee Retention Credit				$ 0	$ 3,000
Cost of Sales [Member]
Employee Retention Credits Benefit						$ 1,800
Selling, General and Administrative Expenses [Member]
Employee Retention Credits Benefit						800
Research and Development Expense [Member]
Employee Retention Credits Benefit						700
Prepaid Expenses and Other Current Assets [Member]
Employee Retention Credits Receivable				$ 300		$ 3,300
Maximum [Member]
Percentage of Qualified Wages Paid	70.00%	70.00%	50.00%