Note 4 - Long-term Debt (Details Textual)		1 Months Ended	12 Months Ended
	Apr. 23, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) ft² a Rate	Dec. 31, 2019 USD ($) Rate
Proceeds from Issuance of Long-term Debt, Total			$ 1,397,000	$ 1,500,000
Repayments of Long-term Debt, Total			2,232,000	$ 1,700,000
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total		$ 0.20
Repayments of Long-term Debt, Total	$ 0.20
First Hawaiian Bank Revolving Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000,000
Debt Instrument, Interest Rate, Effective Percentage			3.65%	5.19%
Line of Credit Facility, Commitment Fee Amount			$ 0
Debt Instrument, Covenant, Required Minimum Liquidity			2,000,000
Debt Instrument, Covenant, Maximum Total Liabilities			$ 45,000,000
First Hawaiian Bank Revolving Line of Credit [Member] | Revolving Credit Facility [Member] | Kapalua Mauka [Member]
Pledged Assets not Separately Reported, Area of Real Estate (Acre) | a			800
First Hawaiian Bank Revolving Line of Credit [Member] | Revolving Credit Facility [Member] | Kapalua Resort [Member]
Pledged Assets not Separately Reported, Area of Real Estate (Acre) | ft²			30,000
First Hawaiian Bank Revolving Line of Credit [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate (Rate) | Rate			3.50%