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Note 5 - New Accounting Standards - Impact of Adoption on AOCI and Retained Earnings (Details) - USD ($)
Mar. 31, 2019
Jul. 02, 2018
Jul. 01, 2018
Balance $ 24,578,230   $ 24,483,675
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]      
Balance   $ 2,102,745  
Reclassification   (2,102,745)  
Balance    
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]      
Balance   14,010,725  
Reclassification   2,102,745  
Balance   $ 16,113,470