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Note 11 - Stock-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2024
$ / shares
shares
Market Vesting Options [Member]  
Balance, Number (in shares) | shares 733,334
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3
Granted, Number (in shares) | shares 0
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited or expired, Number (in shares) | shares 0
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Balance, Number (in shares) | shares 733,334
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3
Time Vesting Options [Member]  
Balance, Number (in shares) | shares 662,798
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 10
Granted, Number (in shares) | shares 0
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited or expired, Number (in shares) | shares (334)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 71.1
Balance, Number (in shares) | shares 662,464
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.97
Performance Vesting Options [Member]  
Balance, Number (in shares) | shares 240,000
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 7.59
Granted, Number (in shares) | shares 0
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited or expired, Number (in shares) | shares 0
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Balance, Number (in shares) | shares 240,000
Balance, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 7.59