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Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Balance $ 36,389,531 $ 35,381,349 $ 32,996,163 $ 33,489,207 $ 35,381,349 $ 33,489,207
Share-based compensation expense 295,290 158,327 171,977 133,845    
Issuance of common stock upon exercise of stock options, net (in shares)         140,204 28,282
Issuance of common stock upon exercise of stock options, net 113,833 144,214 42,644 2,528    
Issuance of common stock upon vesting of restricted stock units    
Other comprehensive income (loss) (69,352) 85,314 (69,091) (54,335)    
Net income 301,575 620,327 1,178,850 1,045,940 $ 921,902 $ 2,224,790
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (in shares)         (13,063) 0
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (41,410)          
Stock buyback (398,256)   (550,000) (1,621,022)    
Share-based compensation expense 295,290 158,327 171,977 133,845    
Balance $ 36,591,211 $ 36,389,531 $ 33,770,543 $ 32,996,163 $ 36,591,211 $ 33,770,543
Common Stock [Member]            
Balance (in shares) 33,033,330 32,949,987 32,589,321 33,176,146 32,949,987 33,176,146
Balance $ 331 $ 330 $ 326 $ 332 $ 330 $ 332
Share-based compensation expense    
Issuance of common stock upon exercise of stock options, net (in shares) 56,861 83,343 26,682 1,600    
Issuance of common stock upon exercise of stock options, net $ 1    
Issuance of common stock upon vesting of restricted stock units (in shares) 198,106 156,115    
Issuance of common stock upon vesting of restricted stock units $ 2 $ 2    
Other comprehensive income (loss)    
Net income    
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (in shares) (13,063)          
Shares retained for payment of taxes in connection with net share settlement of restricted stock units          
Stock buyback (in shares) (156,505)   (200,000) (588,425)    
Stock buyback $ (2)   $ (2) $ (6)    
Share-based compensation expense    
Balance (in shares) 33,118,729 33,033,330 32,572,118 32,589,321 33,118,729 32,572,118
Balance $ 331 $ 331 $ 326 $ 326 $ 331 $ 326
Additional Paid-in Capital [Member]            
Balance 89,874,181 89,571,641 88,766,502 90,251,145 89,571,641 90,251,145
Share-based compensation expense 295,290 158,327 171,977 133,845    
Issuance of common stock upon exercise of stock options, net 113,833 144,213 42,644 2,528    
Issuance of common stock upon vesting of restricted stock units (2) (2)    
Other comprehensive income (loss)    
Net income    
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (41,410)          
Stock buyback (398,254)   (549,998) (1,621,016)    
Share-based compensation expense 295,290 158,327 171,977 133,845    
Balance 89,843,638 89,874,181 88,431,123 88,766,502 89,843,638 88,431,123
Retained Earnings [Member]            
Balance (53,111,576) (53,731,903) (55,470,955) (56,516,895) (53,731,903) (56,516,895)
Share-based compensation expense    
Issuance of common stock upon exercise of stock options, net    
Issuance of common stock upon vesting of restricted stock units    
Other comprehensive income (loss)    
Net income 301,575 620,327 1,178,850 1,045,940    
Shares retained for payment of taxes in connection with net share settlement of restricted stock units          
Stock buyback      
Share-based compensation expense    
Balance (52,810,001) (53,111,576) (54,292,105) (55,470,955) (52,810,001) (54,292,105)
AOCI Attributable to Parent [Member]            
Balance (373,405) (458,719) (299,710) (245,375) (458,719) (245,375)
Share-based compensation expense    
Issuance of common stock upon exercise of stock options, net    
Issuance of common stock upon vesting of restricted stock units    
Other comprehensive income (loss) (69,352) 85,314 (69,091) (54,335)    
Net income    
Shares retained for payment of taxes in connection with net share settlement of restricted stock units          
Stock buyback      
Share-based compensation expense    
Balance $ (442,757) $ (373,405) $ (368,801) $ (299,710) $ (442,757) $ (368,801)