Note 7 - Accounts Payable, Accrued Liabilities and Other  | 
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2020  | |||
| Notes to Financial Statements | |||
| Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] | 
 Accounts payable at  
 March 31, 2020  and  December 31, 2019  includes an aggregate of $65,000  March 31, 2020  and  December 31, 2019  includes an aggregate of $914,000  and $925,000,  respectively, due to related parties for accrued termination costs and bonuses. | 
| X | ||||||||||
- Definition The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as current at the end of the reporting period. No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
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