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Note 8 - Stock Compensation Plans - Vesting of Non-vested RSU Grants (Details) - Restricted Stock Units (RSUs) [Member]
Sep. 30, 2023
shares
RSUs vesting (in shares) 1,028,716
Vesting in 2023 [Member]  
RSUs vesting (in shares) 189,000
Vesting in 2024 [Member]  
RSUs vesting (in shares) 300,608
Represents vesting in 2025 [Member]  
RSUs vesting (in shares) 539,108