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Note 5 - New Accounting Standards - Impact of Adoption on AOCI and Retained Earnings (Details) - USD ($)
Sep. 30, 2018
Jul. 02, 2018
Jul. 01, 2018
Balance as of 7/2/2018 $ 24,020,886   $ 24,483,675
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]      
Balance as of 7/2/2018   $ 2,102,745  
Reclassification to retained earnings of cumulative effect adjustment to initially apply new accounting guidance for equity investments which were previously classified as available-for-sale, net of tax $1,394,695   (2,102,745)  
Adjusted balance as of 7/2/2018    
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]      
Balance as of 7/2/2018   14,010,725  
Reclassification to retained earnings of cumulative effect adjustment to initially apply new accounting guidance for equity investments which were previously classified as available-for-sale, net of tax $1,394,695   2,102,745  
Adjusted balance as of 7/2/2018   $ 16,113,470