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Note 12 - Stock-based Compensation - Stock Option Plan (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Beginning balance, number outstanding (in shares) 618,500 417,000
Beginning balance, weighted average exercise price (in dollars per share) $ 7.32 $ 11.26
Granted (in shares) 198,500 333,500
Granted, weighted average exercise price (in dollars per share) $ 5.04 $ 4.13
Expired / cancelled (in shares) (144,000) (132,000)
Expired / cancelled, weighted average exercise price (in dollars per share) $ 11.72 $ 11.73
Exercised (in shares) 0 0
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 0
Ending balance, number outstanding (in shares) 673,000 618,500
Ending balance, weighted average exercise price (in dollars per share) $ 5.70 $ 7.32