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Note 8 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details)
 6 Months Ended
Jun. 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 (15,597)
Options, exercised, weighted average exercise price (in dollars per share) | $ / shares $ 2.72
Options, Cancelled / Forfeited in Period (in shares) | shares (29,928)
Options, Cancelled / Forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.93
Opening Balance, Stock Options Outstanding (in shares) | shares 1,359,291
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.11
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 690,051
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 5.11
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 (54,631)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.47
Restricted Stock Units Outstanding , Balance (in shares) | shares 1,544,427
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 4.19
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 205,122
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 5.92
Restricted Stock Units, Vested in Period (in shares) | shares (163,223)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 2.98
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | shares (7,823)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.18
Restricted Stock Units Outstanding , Balance (in shares) | shares 894,231
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares $ 3.80