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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jul. 01, 2018
Cash, FDIC Insured Amount | $ 250,000 |  |  |
Cash, Uninsured Amount | 4,507,000 | $ 4,488,000 |  |
Depreciation, Total | 7,462,000 | 7,005,000 | $ 6,171,000 |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset | $ 0 |  |  |
Standard Warranty Extended Term for Exceptions | 10 years |  |  |
Defined Contribution Plan, Cost | $ 1,195,214 | 2,373,000 | 2,327,000 |
Research and Development Expense, Total | $ 5,952,000 | $ 5,700,000 | $ 5,549,000 |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | 720,000 | 844,000 | 872,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 27.60% | 34.00% | 35.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ 3,322,991 |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ 15,124,000 | $ 39,819,000 |  |
Minimum [Member] |  |  |  |
Media Content Service Period | 30 days |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |  |
Standard Warranty Term | 1 year |  |  |
Minimum [Member] | Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  | $ 600,000
Maximum [Member] |  |  |  |
Media Content Service Period | 1 year |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |  |
Standard Warranty Term | 5 years |  |  |
Maximum [Member] | Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  | $ 1,000,000
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |  |

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