Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Amortization of Capitalized Contract Cost [Table Text Block]

	2020		2019		2018
	(In thousands)
Direct expenses	$	272	$	34	$	83
Selling, general and administrative expenses	$	2,970	$	2,874	$	2,400
Total amortization	$	3,242	$	2,908	$	2,483

Financing Receivable, Allowance for Credit Loss [Table Text Block]

	Balance at Beginning of Year		Bad Debt Expense		Write-offs, net of Recoveries		Balance at End of Year
Year Ended December 31, 2018	$	200	$	80	$	105	$	175
Year Ended December 31, 2019	$	175	$	75	$	106	$	144
Year Ended December 31, 2020	$	144	$	46	$	70	$	120

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	2020			2019			2018
	(In thousands)
Amounts charged against income, before income tax benefit	$	680		$	1,224		$	1,514
Amount of related income tax benefit		(6,764	)		(2,081	)		(3,566	)
Net (benefit) expense to net income	$	(6,084	)	$	(857	)	$	(2,052	)

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Level 1		Level 2		Level 3		Total
	(In thousands)
As of December 31, 2020
Money Market Funds	$	5,015	$	--	$	--	$	5,015
Total Cash Equivalents	$	5,015	$	--	$	--	$	5,015
As of December 31, 2019
Money Market Funds	$	3,662	$	--	$	--	$	3,662
Total Cash Equivalents	$	3,662	$	--	$	--	$	3,662

	December 31, 2020		December 31, 2019
	(In thousands)
Total carrying amount of long-term debt	$	30,713	$	34,281
Estimated fair value of long-term debt	$	32,943	$	35,205

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2020			2019			2018
	Common Stock			Common Stock			Common Stock (formerly Class A)			Class B Common Stock
	(In thousands, except per share data)
Numerator for net income per share - basic:
Net income	$	37,260		$	32,406		$	25,423		$	4,624
Allocation of distributed and undistributed income to unvested restricted stock shareholders		(57	)		(109	)		(82	)		(18	)
Net income attributable to common shareholders	$	37,203		$	32,297		$	25,341		$	4,606
Denominator for net income per share - basic:
Weighted average common shares outstanding – basic		25,170			24,809			23,562			3,527
Net income per share - basic	$	1.48		$	1.30		$	1.08		$	1.31
Numerator for net income per share - diluted:
Net income attributable to common shareholders for basic computation	$	37,203		$	32,297		$	25,341		$	4,606
Denominator for net income per share - diluted:
Weighted average common shares outstanding – basic		25,170			24,809			23,562			3,527
Weighted average effect of dilutive securities – stock options		526			844			886			101
Denominator for diluted earnings per share – adjusted weighted average shares		25,696			25,653			24,448			3,628
Net income per share - diluted	$	1.45		$	1.26		$	1.04		$	1.27