Note 9 - Notes Payable and Special Assessment Obligations - Debt, Notes Payable, and Special Assessment Obligations (Details) (Parentheticals) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Unamortized discount	$ 764
The $32.3 Million Notes Payable [Member]
Effective rate	5.41%	5.31%
Secured Debt [Member] \| The $32.3 Million Notes Payable [Member]
Interest rate	2.09%	1.56%
Face amount	$ 32,300	$ 32,300
Maturity date	Oct. 01, 2020	Oct. 01, 2020
Secured Debt [Member] \| The $5.9 Million Notes Payable [Member]
Variable rate	3.00%	2.00%
Interest rate	7.50%	5.75%
Face amount	$ 5,900	$ 5,900
Maturity date	Dec. 31, 2019	Dec. 31, 2019
Secured Debt [Member] \| Special Assessment Bonds [Member]
Face amount	$ 2,300	$ 2,300
Maturity date	Dec. 31, 2022	Dec. 31, 2022
Secured Debt [Member] \| Special Assessment Bonds [Member] \| Minimum [Member]
Stated rate	6.00%	6.00%
Secured Debt [Member] \| Special Assessment Bonds [Member] \| Maximum [Member]
Stated rate	7.50%	7.50%
Secured Debt [Member] \| Prime Rate [Member] \| The $32.3 Million Notes Payable [Member]
Variable rate	3.25%	3.75%
Unsecured Debt [Member] \| The $10.2 Million Notes Payable [Member]
Face amount	$ 10,200	$ 10,200
Maturity date	Apr. 28, 2019	Apr. 28, 2019
Effective rate	14.60%	14.60%
Unamortized discount	$ 800	$ 1,200
Stated rate	4.00%	4.00%

The effective reference rate on a debt instrument.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount.

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