Note 19 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Total, estimated fair value	$ 21,602	$ 20,716
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	225	444
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	10,662	10,662
Subordinated debt, at fair value	58,218	50,928
Fair Value, Recurring [Member]
Total, estimated fair value	21,602	20,716
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	225	444
Limited liability investments, at fair value	20,362	32,811
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	10,662	10,662
Total assets	52,851	64,633
Subordinated debt, at fair value	58,218	50,928
Stock-based compensation liabilities	1,134	443
Derivative contract - interest rate swap	73
Total liabilities	59,425	51,371
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0	0
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	193	172
Limited liability investments, at fair value	0	0
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	0	0
Total assets	193	172
Subordinated debt, at fair value	0	0
Stock-based compensation liabilities	0	0
Derivative contract - interest rate swap	0
Total liabilities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	21,602	20,716
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	32	272
Limited liability investments, at fair value	0	0
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	0	0
Total assets	21,634	20,988
Subordinated debt, at fair value	58,218	50,928
Stock-based compensation liabilities	0	0
Derivative contract - interest rate swap	73
Total liabilities	58,291	50,928
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0	0
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Limited liability investments, at fair value	3,302	3,263
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	10,662	10,662
Total assets	13,964	13,925
Subordinated debt, at fair value	0	0
Stock-based compensation liabilities	1,134	443
Derivative contract - interest rate swap	0
Total liabilities	1,134	443
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0	0
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Limited liability investments, at fair value	17,060	29,548
Real estate investments, at fair value (cost of $10,225 and $10,225, respectively)	0	0
Total assets	17,060	29,548
Subordinated debt, at fair value	0	0
Stock-based compensation liabilities	0	0
Derivative contract - interest rate swap	0
Total liabilities	0	0
US Government Agencies Debt Securities [Member]
Total, estimated fair value	10,490	10,104
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]
Total, estimated fair value	10,490	10,104
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	10,490	10,104
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0	0
US States and Political Subdivisions Debt Securities [Member]
Total, estimated fair value	1,284	1,454
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Total, estimated fair value	1,284	1,454
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	1,284	1,454
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Total, estimated fair value	6,066	5,394
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]
Total, estimated fair value	6,066	5,394
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	6,066	5,394
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0	0
Asset-backed Securities [Member]
Total, estimated fair value	127
Asset-backed Securities [Member] | Fair Value, Recurring [Member]
Total, estimated fair value	127
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	127
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0
Corporate Debt Securities [Member]
Total, estimated fair value	3,635	3,764
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Total, estimated fair value	3,635	3,764
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total, estimated fair value	0	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total, estimated fair value	3,635	3,764
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total, estimated fair value	0	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Total, estimated fair value	0	0
Common Stock [Member] | Fair Value, Recurring [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	193	155
Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	193	155
Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Warrant [Member] | Fair Value, Recurring [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	32	289
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	17
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	32	272
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	0	0
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Equity investments, at fair value (cost of $1,147 and $1,157, respectively)	$ 0	$ 0