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Note 11 - Stockholders' Equity - Outstanding and Exercisable Options (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Exercise Price Range 1 [Member]  
Exercise price range, lower limit (in dollars per share) $ 4
Exercise price range, upper limit (in dollars per share) $ 7
Number of options outstanding (in shares) | shares 15,930
Number of options outstanding, weighted average remaining contractual term (Year) 2 years
Number of options outstanding, weighted average exercise price (in dollars per share) $ 4.25
Number of options outstanding, intrinsic value | $ $ 117,404
Number of options exercisable (in shares) | shares 15,930
Number of options exercisable, weighted average exercise price (in dollars per share) $ 4.25
Number of options exercisable, intrinsic value | $ $ 117,404
Exercise Price Range 2 [Member]  
Exercise price range, lower limit (in dollars per share) $ 7
Exercise price range, upper limit (in dollars per share) $ 10
Number of options outstanding (in shares) | shares 7,000
Number of options outstanding, weighted average remaining contractual term (Year) 3 years
Number of options outstanding, weighted average exercise price (in dollars per share) $ 7.90
Number of options outstanding, intrinsic value | $ $ 26,040
Number of options exercisable (in shares) | shares 9,800
Number of options exercisable, weighted average exercise price (in dollars per share) $ 7.90
Number of options exercisable, intrinsic value | $ $ 26,040
Exercise Price Range 3 [Member]  
Exercise price range, lower limit (in dollars per share) $ 10.01
Exercise price range, upper limit (in dollars per share) $ 12
Number of options outstanding (in shares) | shares 240,000
Number of options outstanding, weighted average remaining contractual term (Year) 8 years 109 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 10.96
Number of options outstanding, intrinsic value | $ $ 158,400
Number of options exercisable (in shares) | shares 65,000
Number of options exercisable, weighted average exercise price (in dollars per share) $ 11.17
Number of options exercisable, intrinsic value | $ $ 27,000
Exercise Price Range 4 [Member]  
Exercise price range, lower limit (in dollars per share) $ 12.01
Exercise price range, upper limit (in dollars per share) $ 15
Number of options outstanding (in shares) | shares 125,000
Number of options outstanding, weighted average remaining contractual term (Year) 4 years 182 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 15
Number of options outstanding, intrinsic value | $ $ 0
Number of options exercisable (in shares) | shares 125,000
Number of options exercisable, weighted average exercise price (in dollars per share) $ 15
Number of options exercisable, intrinsic value | $ $ 0