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Note 17 - Stockholders' Equity - Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Exercisable, beginning of period (in shares) 103,463 83,275
Exercisable, beginning of period (in dollars per share) $ 5.38 $ 5.20
Vested (in shares) 66,801 37,138
Vested (in dollars per share) $ 3.67 $ 5.70
Exercised (in shares)
Exercised (in dollars per share)
Cancelled/Expired (in shares) (5,000) (16,950)
Cancelled/Expired (in dollars per share) $ 5.76 $ 5.17
Exercisable at the end of period (in shares) 165,264 103,463
Exercisable at the end of period (in dollars per share) $ 4.05 $ 5.38
Outstanding, beginning of period (in shares) 476,144 143,094
Outstanding, beginning of period, weighted average exercise price (in dollars per share) $ 3.97 $ 5.22
Granted (in shares) 350,000
Granted, weighted average exercise price (in dollars per share) $ 3.52
Exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Cancelled/Expired (in shares) (5,000) (16,950)
Cancelled/Expired, weighted average exercise price (in dollars per share) $ 5.76 $ 5.17
Outstanding at the end of period (in shares) 471,144 476,144
Outstanding at the end of period, weighted average exercise price (in dollars per share) $ 3.95 $ 3.97