Note 19 - Revisions of Previously Issued Unaudited Consolidated Financial Statements (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Condensed Balance Sheet [Table Text Block]

	March 31, 2023							March 31, 2022
	Previously							Previously
	Reported		Adjustments			Revised		Reported		Adjustments			Revised
Shareholders' equity:
Additional paid in capital	$	-	$	17,190,000		$	17,190,000	$	-	$	17,951,000		$	17,951,000
Retained earnings		62,216,000		(17,190,000	)		45,026,000		63,311,000		(17,951,000	)		45,360,000
Total shareholders' equity		60,986,000		-			60,986,000		62,419,000		-			62,419,000
Total liabilities and shareholders' equity	$	64,055,000	$	-		$	64,055,000	$	66,747,000	$	-		$	66,747,000

	June 30, 2023							June 30, 2022
	Previously							Previously
	Reported		Adjustments			Revised		Reported		Adjustments			Revised
Shareholders' equity:
Additional paid in capital	$	-	$	16,865,000		$	16,865,000	$	-	$	17,700,000		$	17,700,000
Retained earnings		62,333,000		(16,865,000	)		45,468,000		63,108,000		(17,700,000	)		45,408,000
Total shareholders' equity		61,121,000		-			61,121,000		61,949,000		-			61,949,000
Total liabilities and shareholders' equity	$	64,341,000	$	-		$	64,341,000	$	66,694,000	$	-		$	66,694,000

	September 30, 2023							September 30, 2022
	Previously							Previously
	Reported		Adjustments			Revised		Reported		Adjustments			Revised
Shareholders' equity:
Additional paid in capital	$	-	$	16,552,000		$	16,552,000	$	-	$	17,402,000		$	17,402,000
Retained earnings		62,757,000		(16,552,000	)		46,205,000		62,559,000		(17,402,000	)		45,157,000
Total shareholders' equity		61,391,000		-			61,391,000		61,261,000		-			61,261,000
Total liabilities and shareholders' equity	$	64,611,000	$	-		$	64,611,000	$	65,081,000	$	-		$	65,081,000

Schedule of Stockholders Equity [Table Text Block]

													Accumulated
							Additional						Other
	Common Stock						Paid-in			Retained			Comprehensive
	Shares			Amount			Capital			Earnings			Income (Loss)			Total
Balance as of December 31, 2022		12,226,306		$	123,000		$	-		$	62,124,000		$	(1,489,000	)	$	60,758,000
Net income		-			-			-			552,000			-			552,000
Common stock repurchased and retired		(200,000	)		(2,000	)		(371,000	)		(460,000	)		-			(833,000	)
Stock-based compensation expense		-			-			22,000			-			-			22,000
Options exercised		109,250			1,000			349,000			-			-			350,000
Total comprehensive income		-			-			-			-			137,000			137,000
Balance as of March 31, 2023		12,135,556			122,000			-			62,216,000			(1,352,000	)		60,986,000
Net income		-			-			-			1,146,000			-			1,146,000
Common stock repurchased and retired		(275,000	)		(3,000	)		(65,000	)		(1,029,000	)		-			(1,097,000	)
Treasury stock excise tax		-			-			(11,000	)		-			-			(11,000	)
Stock-based compensation expense		-			-			22,000			-			-			22,000
Options exercised		15,000			-			54,000			-			-			54,000
Total comprehensive income		-			-			-			-			21,000			21,000
Balance as of June 30, 2023		11,875,556			119,000			-			62,333,000			(1,331,000	)		61,121,000
Net income		-			-			-			1,430,000			-			1,430,000
Common stock repurchased and retired		(249,110	)		(2,000	)		(41,000	)		(1,006,000	)		-			(1,049,000	)
Treasury stock excise tax		-			-			(19,000	)		-			-			(19,000	)
Stock-based compensation expense		-			-			24,000			-			-			24,000
Options exercised		10,000			-			36,000			-			-			36,000
Total comprehensive loss		-			-			-			-			(152,000	)		(152,000	)
Balance as of September 30, 2023		11,636,446		$	117,000		$	-		$	62,757,000		$	(1,483,000	)	$	61,391,000

													Accumulated
							Additional						Other
	Common Stock						Paid-in			Retained			Comprehensive
	Shares			Amount			Capital			Earnings			Income (Loss)			Total
Balance as of December 31, 2022 as revised		12,226,306		$	123,000		$	17,099,000		$	45,025,000		$	(1,489,000	)	$	60,758,000
Net income		-			-			-			552,000			-			552,000
Common stock repurchased and retired as revised		(200,000	)		(2,000	)		(280,000	)		(551,000	)		-			(833,000	)
Stock-based compensation expense		-			-			22,000			-			-			22,000
Options exercised		109,250			1,000			349,000			-			-			350,000
Total comprehensive income		-			-			-			-			137,000			137,000
Balance as of March 31, 2023 as revised		12,135,556			122,000			17,190,000			45,026,000			(1,352,000	)		60,986,000
Net income		-			-			-			1,146,000			-			1,146,000
Common stock repurchased and retired as revised		(275,000	)		(3,000	)		(390,000	)		(704,000	)		-			(1,097,000	)
Treasury stock excise tax		-			-			(11,000	)		-			-			(11,000	)
Stock-based compensation expense		-			-			22,000			-			-			22,000
Options exercised		15,000			-			54,000			-			-			54,000
Total comprehensive income		-			-			-			-			21,000			21,000
Balance as of June 30, 2023 as revised		11,875,556			119,000			16,865,000			45,468,000			(1,331,000	)		61,121,000
Net income		-			-			-			1,430,000			-			1,430,000
Common stock repurchased and retired as revised		(249,110	)		(2,000	)		(354,000	)		(693,000	)		-			(1,049,000	)
Treasury stock excise tax		-			-			(19,000	)		-			-			(19,000	)
Stock-based compensation expense		-			-			24,000			-			-			24,000
Options exercised		10,000			-			36,000			-			-			36,000
Total comprehensive loss		-			-			-			-			(152,000	)		(152,000	)
Balance as of September 30, 2023 as revised		11,636,446		$	117,000		$	16,552,000		$	46,205,000		$	(1,483,000	)	$	61,391,000

													Accumulated
							Additional						Other
	Common Stock						Paid-in			Retained			Comprehensive
	Shares			Amount			Capital			Earnings			Loss			Total
Balance as of December 31, 2021		13,115,341		$	132,000		$	-		$	62,488,000		$	(869,000	)	$	61,751,000
Net income		-			-			-			1,522,000			-			1,522,000
Common stock repurchased and retired		(170,000	)		(2,000	)		(55,000	)		(699,000	)		-			(756,000	)
Stock-based compensation expense		-			-			55,000			-			-			55,000
Total comprehensive loss		-			-			-			-			(153,000	)		(153,000	)
Balance as of March 31, 2022		12,945,341			130,000			-			63,311,000			(1,022,000	)		62,419,000
Net income		-			-			-			693,000			-			693,000
Common stock repurchased and retired		(225,500	)		(2,000	)		(62,000	)		(896,000	)		-			(960,000	)
Stock-based compensation expense		-			-			32,000			-			-			32,000
Options exercised		8,332			-			30,000			-			-			30,000
Total comprehensive loss		-			-			-			-			(265,000	)		(265,000	)
Balance as of June 30, 2022		12,728,173			128,000			-			63,108,000			(1,287,000	)		61,949,000
Net income		-			-			-			503,000			-			503,000
Common stock repurchased and retired		(259,200	)		(2,000	)		(62,000	)		(1,052,000	)		-			(1,116,000	)
Stock-based compensation expense		-			-			32,000			-			-			32,000
Options exercised		8,332			-			30,000			-			-			30,000
Total comprehensive loss		-			-			-			-			(137,000	)		(137,000	)
Balance as of September 30, 2022		12,477,305		$	126,000		$	-		$	62,559,000		$	(1,424,000	)	$	61,261,000

													Accumulated
							Additional						Other
	Common Stock						Paid-in			Retained			Comprehensive
	Shares			Amount			Capital			Earnings			Loss			Total
Balance as of December 31, 2021 as revised		13,115,341		$	132,000		$	18,131,000		$	44,357,000		$	(869,000	)	$	61,751,000
Net income		-			-			-			1,522,000			-			1,522,000
Common stock repurchased and retired as revised		(170,000	)		(2,000	)		(235,000	)		(519,000	)		-			(756,000	)
Stock-based compensation expense		-			-			55,000			-			-			55,000
Total comprehensive loss		-			-			-			-			(153,000	)		(153,000	)
Balance as of March 31, 2022 as revised		12,945,341			130,000			17,951,000			45,360,000			(1,022,000	)		62,419,000
Net income		-			-			-			693,000			-			693,000
Common stock repurchased and retired as revised		(225,500	)		(2,000	)		(313,000	)		(645,000	)		-			(960,000	)
Stock-based compensation expense		-			-			32,000			-			-			32,000
Options exercised		8,332			-			30,000			-			-			30,000
Total comprehensive loss		-			-			-			-			(265,000	)		(265,000	)
Balance as of June 30, 2022 as revised		12,728,173			128,000			17,700,000			45,408,000			(1,287,000	)		61,949,000
Net income		-			-			-			503,000			-			503,000
Common stock repurchased and retired as revised		(259,200	)		(2,000	)		(360,000	)		(754,000	)		-			(1,116,000	)
Stock-based compensation expense		-			-			32,000			-			-			32,000
Options exercised		8,332			-			30,000			-			-			30,000
Total comprehensive loss		-			-			-			-			(137,000	)		(137,000	)
Balance as of September 30, 2022 as revised		12,477,305		$	126,000		$	17,402,000		$	45,157,000		$	(1,424,000	)	$	61,261,000