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Note C - Summary of Significant Accounting Policies (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Number of Operating Segments |  | 2 |
Allowance for Doubtful Accounts Receivable, Ending Balance |  | $ 10,000 | $ 10,000
Inventory Valuation Reserves, Ending Balance |  | $ 763,000 | $ 220,000
Options and Warrants [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 3,203,553 | 3,710,335
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |
Milestone Education LLC [Member] |  |  |
Additional Interest In Subsidiaries Acquired During Period, Percentage. | 50.00% |  |

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