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Note 14 - Stock Option Plans - Stock Option Activity (Details) - $ / shares
 12 Months Ended 180 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Options outstanding at January 1 (in shares) 304,500 274,500  
Options cancelled (in shares) (18,000) 0 (258,680)
Options exercised (in shares) (60,000) (12,000) (800,320)
Options granted (in shares) 17,000 42,000 1,302,500
Options outstanding at December 31 (in shares) 243,500 304,500 243,500
Options available for grant at December 31 (in shares) 817,000 834,000 817,000
Options exercisable at December 31 (in shares) 206,500 256,500 206,500
Granted (in dollars per share) $ 3.86 $ 3.78  
Exercised (in dollars per share) 1.63 1.18  
Outstanding (in dollars per share) 2.17 2.06 $ 2.17
Exercisable at December 31 (in dollars per share) 1.87 1.76 1.87
Minimum [Member]      
Granted (in dollars per share)   3.50  
Exercised (in dollars per share) 1.52 0.69  
Outstanding (in dollars per share) 0.69 0.69 0.69
Maximum [Member]      
Granted (in dollars per share)   3.89  
Exercised (in dollars per share) 1.72 1.66  
Outstanding (in dollars per share) $ 3.89 $ 3.89 $ 3.89