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Note 11 - Stockholders' Equity - Stock Option Plan (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Exercise of stock options (in shares) 100,000 0
Ending balance, number outstanding (in shares) 284,730  
Number of shares exercisable (in shares) 124,730  
The 1989 Non-qualified Stock Option Plan [Member]    
Beginning balance, number outstanding (in shares) 35,250 35,250
Granted during period (in shares) 0 0
Exercise of stock options (in shares) 35,250 0
Canceled during period (in shares) 0 0
Ending balance, number outstanding (in shares) 0 35,250
Number of shares exercisable (in shares) 0 35,250
Beginning balance, number outstanding, weighted average exercise price (in dollars per share) $ 4.62 $ 4.62
Granted during period, weighted average exercise price (in dollars per share) 0 0
Exercised during period, weighted average exercise price (in dollars per share) 4.62 0
Canceled during period, weighted average exercise price (in dollars per share) 0 0
Ending balance, number outstanding, weighted average exercise price (in dollars per share) 0 4.62
Number exercisable, weighted average exercise price (in dollars per share) $ 0 $ 4.62
The 2001 Non-qualified Stock Option Plan [Member]    
Beginning balance, number outstanding (in shares) 124,480 124,480
Granted during period (in shares) 0 0
Exercise of stock options (in shares) 64,750 0
Canceled during period (in shares) 0 0
Ending balance, number outstanding (in shares) 59,730 124,480
Number of shares exercisable (in shares) 59,730 124,480
Beginning balance, number outstanding, weighted average exercise price (in dollars per share) $ 4.57 $ 4.57
Granted during period, weighted average exercise price (in dollars per share) 0 0
Exercised during period, weighted average exercise price (in dollars per share) 4.62 0
Canceled during period, weighted average exercise price (in dollars per share) 0 0
Ending balance, number outstanding, weighted average exercise price (in dollars per share) 4.51 4.57
Number exercisable, weighted average exercise price (in dollars per share) $ 4.51 $ 4.57
The 2007 Share Incentive Plan [Member]    
Beginning balance, number outstanding (in shares) 100,000 100,000
Granted during period (in shares) 125,000 0
Exercise of stock options (in shares) 0 0
Canceled during period (in shares) 0 0
Ending balance, number outstanding (in shares) 225,000 100,000
Number of shares exercisable (in shares) 65,000 20,000
Beginning balance, number outstanding, weighted average exercise price (in dollars per share) $ 11.17 $ 11.17
Granted during period, weighted average exercise price (in dollars per share) 8.04 0
Exercised during period, weighted average exercise price (in dollars per share) 0 0
Canceled during period, weighted average exercise price (in dollars per share) 0 0
Ending balance, number outstanding, weighted average exercise price (in dollars per share) 9.43 11.17
Number exercisable, weighted average exercise price (in dollars per share) $ 9.97 $ 11.17