Note 2 - Summary of Significant Accounting Policies - Effects of Initial Adoption (Details) - USD ($)	Dec. 31, 2019	Jun. 30, 2019	Jan. 01, 2019
Assets	$ 22,009,100	$ 21,253,608
Current portion operating lease liabilities	366,617
Long-term operating lease liabilities	600,231
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(6,122)	(175,659)
Retained earnings	$ 8,132,839	$ 8,152,861
Accounting Standards Update 2016-02 [Member]
Assets			$ 1,113,840
Current portion operating lease liabilities			370,697
Long-term operating lease liabilities			780,219
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Retained earnings

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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