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Note 6 - Leases (Details Textual) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 ft² | Sep. 30, 2020 USD ($) ft² | Feb. 12, 2020 ft² | Aug. 01, 2017 ft² | Jan. 01, 2015
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.48% |  |  |
Operating Lease, Payments | $ |  | $ 812,107 |  |  |
Weighted Average [Member] |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 3 years 361 days |  |  |
7050 Winnetka Avenue North, Brooklyn Park, Minnesota [Member] |  |  |  |  |
Area of Real Estate Property (Square Foot) |  | 71,000 |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  |  |  | 10 years 62 days
Additional area of rental space (Square Foot) | 14,000 |  |  |  |
Operating Lease Termination Fee | $ |  | $ 249,000 |  |  |
Tijuana, Mexico [Member] |  |  |  |  |
Area of Real Estate Property (Square Foot) |  |  |  | 46,000 |
Tijuana, Mexico 2 [Member] |  |  |  |  |
Area of Real Estate Property (Square Foot) |  |  | 52,000 |  |
Lessee, Operating Lease, Term of Contract (Year) |  |  | 3 years 180 days |  |
Lessee, Operating Lease, Number of Options to Renew |  |  | 2 |  |
Lessee, Operating Lease, Renewal Term (Year) |  |  | 3 years |  |

X
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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