Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Revolving Line of Credit (Details Textual)

v3.21.1
Note 6 - Revolving Line of Credit (Details Textual) - Revolving Credit Facility [Member] - TD Bank [Member] - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000  
Long-term Line of Credit, Total $ 500,000 $ 0
London Interbank Offered Rate (LIBOR) Swap Rate [Member] | Minimum [Member]    
Debt Instrument, Basis Spread on Variable Rate 4.00%