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Note 11 - Outstanding and Exercisable Options (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Exercise Price Range 1 [Member]  
Exercise price range, lower limit (in dollars per share) $ 3
Exercise price range, upper limit (in dollars per share) $ 3.99
Number of options outstanding (in shares) | shares 34,000
Number of options outstanding, weighted average remaining contractual term 2 years 346 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 3.65
Number of options outstanding, intrinsic value | $ $ 218,620
Number of options exercisable (in shares) | shares 34,000
Number of options exercisable, weighted average exercise price (in dollars per share) $ 3.65
Number of options exercisable, intrinsic value | $ $ 218,620
Exercise Price Range 2 [Member]  
Exercise price range, lower limit (in dollars per share) $ 4
Exercise price range, upper limit (in dollars per share) $ 4.49
Number of options outstanding (in shares) | shares 15,930
Number of options outstanding, weighted average remaining contractual term 5 years 14 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 4.25
Number of options outstanding, intrinsic value | $ $ 92,872
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 | $ $ 92,872
Exercise Price Range 3 [Member]  
Exercise price range, lower limit (in dollars per share) $ 4.50
Exercise price range, upper limit (in dollars per share) $ 4.99
Number of options outstanding (in shares) | shares 100,000
Number of options outstanding, weighted average remaining contractual term 2 years 284 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 4.62
Number of options outstanding, intrinsic value | $ $ 546,000
Number of options exercisable (in shares) | shares 75,000
Number of options exercisable, weighted average exercise price (in dollars per share) $ 4.62
Number of options exercisable, intrinsic value | $ $ 546,000
Exercise Price Range 4 [Member]  
Exercise price range, lower limit (in dollars per share) $ 5
Exercise price range, upper limit (in dollars per share) $ 7.99
Number of options outstanding (in shares) | shares 9,800
Number of options outstanding, weighted average remaining contractual term 6 years 14 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 7.90
Number of options outstanding, intrinsic value | $ $ 21,364
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 | $ $ 21,364
Exercise Price Range 5 [Member]  
Exercise price range, lower limit (in dollars per share) $ 8
Exercise price range, upper limit (in dollars per share) $ 12
Number of options outstanding (in shares) | shares 100,000
Number of options outstanding, weighted average remaining contractual term 9 years 292 days
Number of options outstanding, weighted average exercise price (in dollars per share) $ 11.17
Number of options outstanding, intrinsic value | $ $ 0
Number of options exercisable (in shares) | shares 0
Number of options exercisable, weighted average exercise price (in dollars per share) $ 11.17
Number of options exercisable, intrinsic value | $ $ 0