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Note 13 - Additional Cash Flow Information - Changes in Operating Assets and Liabilities (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
[1]
Accounts receivable $ 1,031,180 $ (773,330)
Inventories (712,769) 2,206,664
Prepaid expenses and other current assets 72,887 (381)
Income taxes receivable (13,285) 439
Accounts payable 6,882 (813,619)
Accrued liabilities (138,448) 30,834
Net change 246,447 650,607 [2]
Income taxes 1,620 3,182
Interest expense $ 5,218
[1] As adjusted for retrospective adoption of ASC 606 and ASC 842
[2] As adjusted for the retrospective adoption of ASC 606