Note 13 - Federal and State Income Taxes (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
Dec. 21, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		21.00%	34.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 29,300,000
Income Taxes Receivable			$ 1,214,000
Deferred Tax Assets, Tax Credit Carryforwards, General Business			988,000
Operating Loss Carryforwards, Total			66,983,000
Income Tax Examination, Penalties and Interest Expense, Total			$ 0	$ 0
Statute of Limitations			3 years
Receivables, Long-term Contracts or Programs, Total		29,000		29,000
Deferred Tax Assets, Valuation Allowance, Total		$ 0	$ 0	$ 0

Number of years for the statute of limitations to run.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.

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