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	Dec. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2024	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						$ 3,300	$ 300
Maximum [Member]
Percentage of Qualified Wages Paid	70.00%	70.00%	50.00%