Concentrations of Risk (Details) - Investment Risk	12 Months Ended
	Dec. 31, 2019
Lawn Doctor | Percentage of Total Investment Income
Concentration Risk [Line Items]
Concentration risk	31.30%
Lawn Doctor | Percentage of Total Assets
Concentration Risk [Line Items]
Concentration risk	32.10%
Lawn Doctor | Equity Ownership of Portfolio Company Total Assets [Member]
Concentration Risk [Line Items]
Concentration risk	35.70%
Polyform Products, Co. | Percentage of Total Investment Income
Concentration Risk [Line Items]
Concentration risk	33.60%
Polyform Products, Co. | Percentage of Total Assets
Concentration Risk [Line Items]
Concentration risk	17.80%
Polyform Products, Co. | Equity Ownership of Portfolio Company Total Assets [Member]
Concentration Risk [Line Items]
Concentration risk	18.60%
Roundtables [Member] | Percentage of Total Investment Income
Concentration Risk [Line Items]
Concentration risk	8.20%
Roundtables [Member] | Percentage of Total Assets
Concentration Risk [Line Items]
Concentration risk	26.50%
Roundtables [Member] | Equity Ownership of Portfolio Company Total Assets [Member]
Concentration Risk [Line Items]
Concentration risk	29.30%