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Note 15 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Balance $ 32,996,163 $ 33,489,207 $ 33,790,735 $ 35,184,039 $ 33,489,207 $ 35,184,039
Share-based compensation expense 171,975 133,845 145,789 138,461    
Issuance of common stock upon exercise of stock options, net (in shares)         28,282  
Issuance of common stock upon exercise of stock options, net 42,644 2,528 26,200 159,518    
Issuance of common stock upon vesting of restricted stock units 2    
Stock buyback (550,000) (1,621,022)    
Other comprehensive loss (69,091) (54,335) (4,482) (8,031)    
Net income (loss) 1,178,850 1,045,940 460,908 (1,683,252) $ 2,224,790 (1,222,344)
Balance $ 33,770,543 $ 32,996,163 $ 34,419,150 $ 33,790,735 $ 33,770,543 $ 34,419,150
Common Stock [Member]            
Balance (in shares) 32,589,321 33,176,146 32,249,288 32,158,436 33,176,146 32,158,436
Balance $ 326 $ 332 $ 322 $ 322 $ 332 $ 322
Share-based compensation expense        
Issuance of common stock upon exercise of stock options, net (in shares) 26,682 1,600 20,000 90,852    
Issuance of common stock upon exercise of stock options, net        
Issuance of common stock upon vesting of restricted stock units $ 2    
Stock buyback (in shares) (200,000) (588,425)        
Stock buyback $ (2) $ (6)    
Other comprehensive loss        
Net income (loss)    
Issuance of common stock upon vesting of restricted stock units (in shares) 156,115   125,000      
Balance (in shares) 32,572,118 32,589,321 32,394,288 32,249,288 32,572,118 32,394,288
Balance $ 326 $ 326 $ 322 $ 322 $ 326 $ 322
Additional Paid-in Capital [Member]            
Balance 88,766,502 90,251,145 88,254,818 87,956,839 90,251,145 87,956,839
Share-based compensation expense 171,975 133,845 145,789 138,461    
Issuance of common stock upon exercise of stock options, net 42,644 2,528 26,200 159,518    
Issuance of common stock upon vesting of restricted stock units    
Stock buyback (549,998) (1,621,016)    
Other comprehensive loss        
Net income (loss)    
Balance 88,431,123 88,766,502 88,426,807 88,254,818 88,431,123 88,426,807
Retained Earnings [Member]            
Balance (55,470,955) (56,516,895) (54,455,105) (52,771,853) (56,516,895) (52,771,853)
Share-based compensation expense        
Issuance of common stock upon exercise of stock options, net        
Issuance of common stock upon vesting of restricted stock units    
Stock buyback    
Other comprehensive loss        
Net income (loss) 1,178,850 1,045,940 460,908 (1,683,252)    
Balance (54,292,105) (55,470,955) (53,994,197) (54,455,105) (54,292,105) (53,994,197)
AOCI Attributable to Parent [Member]            
Balance (299,710) (245,375) (9,300) (1,269) (245,375) (1,269)
Share-based compensation expense        
Issuance of common stock upon exercise of stock options, net        
Issuance of common stock upon vesting of restricted stock units    
Stock buyback    
Other comprehensive loss (69,091) (54,335) (4,482) (8,031)    
Net income (loss)    
Balance $ (368,801) $ (299,710) $ (13,782) $ (9,300) $ (368,801) $ (13,782)