Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Warrants (Details Textual)

v3.21.1
Note 4 - Warrants (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Expense $ 405,000 $ 397,000  
Equity Classified Warrants [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 109,639   109,639
Class of Warrant or Right, Vested and Exercisable (in shares) 85,472   85,472
Share-based Payment Arrangement, Expense $ 0 0  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 124,000 $ 124,000