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Note 1 - Organization and Significant Accounting Policies - Impact of Adoption on AOCI and Retained Earnings (Details) - USD ($)
Jun. 28, 2020
Jun. 30, 2019
Jul. 02, 2018
Jul. 01, 2018
Balance $ 22,517,017 $ 23,920,166    
AOCI Attributable to Parent [Member]        
Balance   $ 2,102,745
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]        
Balance      
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]        
Balance     2,102,745  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]        
Balance     (2,102,745)  
Retained Earnings [Member]        
Balance $ 14,146,812 $ 15,549,961   $ 14,010,725
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]        
Balance     14,010,725  
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]        
Balance     2,102,745  
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]        
Balance     $ 16,113,470