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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
[1]
Jun. 30, 2017
Deferred compensation $ 642,424 $ 635,936  
Stock-based compensation 228,981 420,204  
Accrued expenses and reserves 705,828 997,924  
Federal and state net operating loss carryforwards 697,621 630,344  
Equipment and leasehold improvements 122,714 26,568  
Valuation allowance (2,382,087) (2,710,628) $ (444,409)
Total deferred income tax assets 15,481 348  
Other (2,205) (348)  
Net deferred income tax assets $ 13,276 [2]  
[1] As adjusted for the retrospective adoption of ASC 606 and ASC 842
[2] As adjusted for the retrospective adoption of ASC 606 and ASC 842