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Note 10 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Opening Balance, Stock Options Outstanding (in shares) 2,266,122 1,956,732
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.93 $ 4.25
Options, Granted in Period (in shares) 894,154 943,424
Options, Granted in Period, Weighted Average Exercise Price (in dollars per share) $ 2.61 $ 3.28
Options, exercised (in shares) (253,853) (3,750)
Options, exercised, weighted average exercise price (in dollars per share) $ 3.94 $ 2.98
Options, Cancelled / Forfeited in Period (in shares) (269,084) (630,284)
Options, Cancelled / Forfeited, Weighted Average Exercise Price (in dollars per share) $ 3.68 $ 3.96
Opening Balance, Stock Options Outstanding (in shares) 2,637,339 2,266,122
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.51 $ 3.93
Restricted Stock Units (RSUs) [Member]    
Restricted Stock Units Outstanding , Balance (in shares) 1,590,450 1,233,762
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) $ 2.27 $ 3.36
Restricted Stock Units, Granted in Period (in shares) 1,027,486 1,652,720
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) $ 2.75 $ 2.31
Restricted Stock Units, Vested in Period (in shares) (930,985) (813,762)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) $ 2.41 $ 3.29
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) (126,490) (482,270)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) $ 3.13 $ 3.42
Market Condition RSU - factor adjustment (in shares) 0  
Market Condition RSU - factor adjustment (in dollars per share) $ 0  
Restricted Stock Units Outstanding , Balance (in shares) 1,560,461 1,590,450
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) $ 2.44 $ 2.27
Market Condition Restricted Stock Units [Member]    
Restricted Stock Units Outstanding , Balance (in shares) 529,491 116,944
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) $ 1.67 $ 4.19
Restricted Stock Units, Granted in Period (in shares) 332,622 605,005
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) $ 2.98 $ 1.98
Restricted Stock Units, Vested in Period (in shares) (240,205) (3,778)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) $ 1.53 $ 4.19
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) (41,932) (188,680)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) $ 3.04 $ 4.18
Market Condition RSU - factor adjustment (in shares) 233,055  
Market Condition RSU - factor adjustment (in dollars per share) $ 1.47  
Restricted Stock Units Outstanding , Balance (in shares) 813,031 529,491
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) $ 2.12 $ 1.67