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Note 18 - Subsequent Events (Details Textual) - Revolving Credit Facility [Member] - HSBC Venture Bank USA Inc. [Member] - USD ($)
$ in Millions
Nov. 03, 2023
Apr. 07, 2020
Line of Credit Facility, Maximum Borrowing Capacity   $ 30
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.50%
Secured Overnight Financing Rate (SOFR) [Member]    
Debt Instrument, Basis Spread on Variable Rate   3.60%
Subsequent Event [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 30  
Line of Credit Facility, Additional Borrowing Capacity $ 20  
Debt Instrument, Maturity Date Nov. 03, 2026  
Subsequent Event [Member] | Minimum [Member]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
Subsequent Event [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 3.00%  
Subsequent Event [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 3.25%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.55%