Note 15 - Supplemental Disclosure for Statements of Cash Flows  | 
3 Months Ended | ||
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Mar. 31, 2020  | |||
| Notes to Financial Statements | |||
| Cash Flow, Supplemental Disclosures [Text Block] | 
 During the   
three -month periods ended  March  
31,  2020  and 2019,  we paid interest aggregating $3,000  and $4,000,  respectively. During the three -month period ended  March 31, 2020,  we issued 53,315  shares of our common stock valued at $65,000  to our employees as partial payment in lieu of cash for their 2019  bonuses. | 
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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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