Note 10 - Leases (Details Textual)  | 
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
| 
 Jun. 30, 2017  
USD ($) 
 | 
 Mar. 31, 2021  
USD ($)  
ft² 
 | 
 Mar. 31, 2020  
USD ($) 
 | 
|
| Operating Lease, Expense | $ 46,000 | $ 51,000 | |
| Operating Lease, Payments | $ 93,000 | $ 91,000 | |
| Office Space at 4995 Bradenton Avenue, Dublin Ohio [Member] | |||
| Area of Real Estate Property (Square Foot) | ft² | 5,000 | ||
| Operating Lease, Monthly Base Rent | $ 3,000 | ||
| Office Space at 5600 Blazer Parkway, Dublin, Ohio [Member] | |||
| Area of Real Estate Property (Square Foot) | ft² | 25,000 | ||
| Operating Lease, Monthly Base Rent | $ 39,000 | $ 27,000 | |
| Lessee, Operating Lease, Renewal Term (Year) | 5 years | ||
| Vehicle Lease [Member] | |||
| Operating Lease, Monthly Base Rent | $ 300 | ||
| Office Equipment [Member] | |||
| Operating Lease, Monthly Base Rent | $ 100 | ||
| X | ||||||||||
- Definition Amount of the base monthly rent required for operating lease. No definition available. 
  | 
| X | ||||||||||
- Definition Area of a real estate property. No definition available. 
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
  | 
| X | ||||||||||
- Definition Amount of operating lease expense. Excludes sublease income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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