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Note 8 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details)
 9 Months Ended
Sep. 30, 2022
$ / shares
shares
Opening Balance, Stock Options Outstanding (in shares) | shares 1,404,816
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.10
Options, Granted in Period (in shares) | shares 0
Options, Granted in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Options, exercised (in shares) | shares (40,267)
Options, exercised, weighted average exercise price (in dollars per share) | $ / shares $ 2.64
Options, Cancelled / Forfeited in Period (in shares) | shares (76,658)
Options, Cancelled / Forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.81
Opening Balance, Stock Options Outstanding (in shares) | shares 1,287,891
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.13
Restricted Stock Units (RSUs) [Member]  
Restricted Stock Units Outstanding , Balance (in shares) | shares 1,141,164
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.57
Restricted Stock Units, Granted in Period (in shares) | shares 807,345
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.91
Restricted Stock Units, Vested in Period (in shares) | shares (232,157)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.77
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | shares (145,580)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.64
Restricted Stock Units Outstanding , Balance (in shares) | shares 1,570,772
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.13
Market Condition Restricted Stock Units [Member]  
Restricted Stock Units Outstanding , Balance (in shares) | shares 860,155
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.13
Restricted Stock Units, Granted in Period (in shares) | shares 283,641
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 5.38
Restricted Stock Units, Vested in Period (in shares) | shares (396,279)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 2.09
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | shares (20,284)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.93
Restricted Stock Units Outstanding , Balance (in shares) | shares 727,233
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.55