v3.21.2
Note 1 - Nature of Operations (Details Textual) - USD ($)
6 Months Ended
Feb. 08, 2021
Feb. 04, 2021
Jan. 28, 2021
Jun. 30, 2021
Common Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares)       2,530,000
The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member]        
Proceeds from Issuance of Common Stock, Net $ 27,600,000      
The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member] | Common Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares)   2,530,000    
Revolving Credit Facility [Member]        
Debt Instrument, Collateral Amount     $ 750,000  
Line of Credit Facility, Commitment Fee Percentage     5.00%