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Note 18 - Stock Option and Purchase Plan - Summary of Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Outstanding (in shares) 1,908,250  
Outstanding, weighted average exercise price per share (in dollars per share) $ 2.07  
Granted (in shares) 272,500  
Granted, weighted average exercise price per share (in dollars per share) $ 1.08  
Exercised (in shares) 0 0
Exercised, weighted average exercise price per share (in dollars per share) $ 0  
Forfeited (in shares) (45,000)  
Forfeited, weighted average exercise price per share (in dollars per share) $ 1.16  
Expired (in shares) (314,750)  
Expired, weighted average exercise price per share (in dollars per share) $ 3.49  
Outstanding (in shares) 1,821,000 1,908,250
Outstanding, weighted average exercise price per share (in dollars per share) $ 1.70 $ 2.07
Outstanding, weighted average remaining term (Year) 2 years 102 days  
Outstanding, aggregate intrinsic value $ 444,000  
Exercisable (in shares) 523,200  
Exercisable, weighted average exercise price per share (in dollars per share) $ 2.99  
Exercisable, weighted average remaining term (Year) 361 days  
Exercisable, aggregate intrinsic value $ 34,000