Note 8 - Stock Compensation Plans - Vesting of Non-vested RSU Grants (Details) - Restricted Stock Units (RSUs) [Member]	Mar. 31, 2023 shares
RSUs vesting (in shares)	1,042,716
Vesting in 2023 [Member]
RSUs vesting (in shares)	201,000
Vesting in 2024 [Member]
RSUs vesting (in shares)	300,608
Represents vesting in 2025 [Member]
RSUs vesting (in shares)	541,108