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Note 4 - Investments - Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member]
$ in Thousands
Jun. 30, 2022
USD ($)
Total Investments $ 2,145
Fair Value, Inputs, Level 1 [Member]  
Total Investments 0
Fair Value, Inputs, Level 2 [Member]  
Total Investments 0
Fair Value, Inputs, Level 3 [Member]  
Total Investments 150
Common Stock [Member]  
Total Investments 150
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]  
Total Investments 0
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]  
Total Investments 0
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]  
Total Investments 150
Investments, at Fair Value [Member]  
Total Investments 150
Investments, at Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]  
Total Investments
Investments, at Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]  
Total Investments
Investments, at Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]  
Total Investments 150
US Government Agencies Debt Securities [Member]  
Total Investments 1,950
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]  
Total Investments 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]  
Total Investments 0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]  
Total Investments