Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Stockholders' Equity (Details Textual)

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Note 12 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2022
May 31, 2022
Apr. 30, 2022
Feb. 28, 2022
Jan. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Proceeds from Issuance of Common Stock               $ 4,588,000 $ 9,331,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           0 0 0 0
Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 12,121 182,293 9,615 47,933 44,780        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value $ 10,000 $ 175,000 $ 10,000 $ 50,000 $ 50,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years 12 months 3 years 3 years 3 years        
ATM [Member]                  
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)               4,217,134  
Proceeds from Issuance of Common Stock               $ 4.6  
Management and Employees [Member]                  
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)               1,105,011  
Board Members [Member]                  
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)               34,118