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Note 11 - Non-vested Option Awards Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Granted (in shares) 43,000    
Granted (in dollars per share) $ 5.28 $ 5.96 $ 6.25
Forfeited (in shares) (31,450)    
Service Based Options [Member]      
Balance at beginning of period, nonvested (in shares) 337,550    
Weighted average grant date fair value, beginning of period, nonvested (in dollars per share) $ 5.77    
Nonvested Contractual Life (Year) 5 years 5 years 146 days  
Granted (in shares) 43,000    
Granted (in dollars per share) $ 5.28    
Granted (Year) 6 years 219 days    
Vested (in shares) (94,650)    
Vested (in dollars per share) $ 5.64    
Vested (Year) 4 years    
Forfeited (in shares) (19,250)    
Forfeited (in dollars per share) $ 5.38    
Forfeited (Year) 3 years 328 days    
Balance at end of period, nonvested (in shares) 266,650 337,550  
Weighted average grant date fair value, end of period, nonvested (in dollars per share) $ 5.76 $ 5.77